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Right Decision Service newsletter: October 2024

Welcome to the Right Decision Service (RDS) newsletter for October 2024.

1.Contingency arrangements for RDS outages

Development of the contingency solutions to maximise RDS resilience and minimise risk of future outages is in progress, aiming for completion by Christmas. As a reminder, these contingency arrangements  are:

  • Optimising mobile app build process
  • Mobile app always to be downloadable.
  • Serialising builds to mobile app; separate mobile app build from other editorial and end-user processes
  • Load balancing – provides failover (also enables separation of editorial processes from other processes to improve performance.)

 

In the meantime, a gentle reminder to encourage users to download essential clinical toolkits to their mobile devices so that there is an offline version always available.

 

2. New deployment with improvements.

A new scheduled deployment with minor improvements drawn from support tickets, externally funded projects, information related to outages, and feature requests will take place in early December. Key improvements planned are:

  • Deep-linking to individual toolkits within the RDS mobile app. Each toolkit will now have its own direct URL and QR code, both accessible from the app. These can be used to download the toolkit directly where users already have the RDS app installed. If the user does not yet have the RDS app installed, they will be taken to the app store to install the app and immediately afterwards the toolkit will automatically open and download. Note that this will go live a few days later than the improvements below due to the need to link up the mobile front end to the changes in the content management system.
  • Introducing an Announcement Header field to replace the hardcoded "Announcements and latest updates" text. This will enable users to see at a glance the focus of new announcements.
  • Automated daily emptying of the recycling bin (with a 30 day rolling grace period)  in the content management system. A bug preventing complete emptying of the recycling bin contributed to one of the outages earlier this year.
  • Supporting multiple passcodes (ticket 6079)
  • Expanding accordion section to show location of a search result rather than requiring user coming from a search result to manually open all sections and search again for the term.
  • Displaying first accordion section Content text as a snippet on the search results page as a fallback if default/main content is not provided
  • Displaying the context of each search result in the form of a link to the relevant parent tool/section. This will help users to choose which search result is most likely to be appropriate for their needs.
  • As part of release of the new national benzodiazepine quality prescribing guidance toolkit sponsored by Scottish Government Effective Prescribing and Therapeutics, a digital tool to support creation of benzodiazepine tapering/withdrawal schedules.

We are also seeking approval to use the NHS Scotland logo and title for the RDS app on the app stores to help with audience engagement and clarity around the provenance of RDS.

3. RDS Search, Browse and Archive/Version control enhancements

We are still hopeful that user acceptance testing for at least the Search and browse enhancements can take place before Christmas. Thank you for your patience and understanding in waiting for these improvements. Timescales have been pushed back by old app migration challenges, work to address outages, and most recently implementing the contingency arrangements.

4. Support tickets

We are aware that there continue to be some issues around a number of RDS support tickets, in part due to constraints around visibility for the RDS team of the tickets in the existing  support portal. We are investigating the potential to move to a new support ticket requesting system from early in the new year. We will organise the proposed webinar around support ticket processes once we have confirmed the way forward with the system.

Table formatting

There is a known issue with alterations in formatting of some RDS tables which seems to have arisen as a result of the 17 October deployment. Tactuum is working on a fix and on implementing additional regression testing to prevent this issue recurring.

5. New RDS toolkits

Recently launched toolkits include:

NHS Lothian Infectious Diseases

Scottish Health Technologies Group – Technology Assessment recommendations

NHS Tayside Anaesthetics and Critical Care projects – an innovative toolkit which uses PowerAutomate to manage review and response to proposals for improvement projects.

If you would like to promote one of your new toolkits through this newsletter, please contact ann.wales3@nhs.scot

A number of toolkits are expected to go live before Christmas, including:

  • Focus on dementia
  • Highland Council Getting it Right for Every Child
  • Dumfries and Galloway Adult Support and Protection procedures
  • National Waiting Well toolkit
  • Fertility Scotland National Network
  • NHS Lothian postural care for care homes

6.Sign up to RDS Editors Teams channel

We have had a good response to the recent invitation to sign up to the new Teams channel for RDS editors. This provides a forum for editors to share learning, ideas and questions and we hope to hold regular webinars on topics of interest.  The RDS team is in the process of joining participants to the channel and we’d encourage all editors to take part, using the registration form – available in Providers section of the RDS Learning and Support area.

 

7. Evaluation projects

The RDS team has worked with colleagues in NHS Grampian and the Digital Health & Care Innovation Centre to evaluate the impact of the Prevent the progress of diabetes web and mobile app in a small-scale pilot project. This app provides access to local and national resources and services targeted at people with prediabetes, a history of gestational diabetes, or candidates for remission. After just 8 weeks of using the app, 94% of patients reported increased their knowledge and understanding of diabetes, and 88% said it had increased their confidence and motivation to make lifestyle changes, highlighting specific behaviour changes. The learning from this project is informing development of a service model based on tailored support for patient groups with, high, medium and low digital self-efficacy.

Please contact ann.wales3@nhs.scot if you would like to know more about this project.

  1. Training sessions for new editors (also serve as refresher sessions for existing editors) will take place on the following dates:

  • Friday 29th November 3-4 pm
  • Thursday 5 December 3.30 -4.30 pm

To book a place, please contact Olivia.graham@nhs.scot, providing your name, organisation, job role, and level of experience with RDS editing (none, a little, moderate, extensive.)

 

To invite colleagues to sign up to receive this newsletter, please signpost them to the registration form  - also available in End-user and Provider sections of the RDS Learning and Support area.   If you have any questions about the content of this newsletter, please contact his.decisionsupport@nhs.scot  If you would prefer not to receive future newsletters, please email Olivia.graham@nhs.scot and ask to be removed from the circulation list.

With kind regards

 

Right Decision Service team

Healthcare Improvement Scotland

 

The Right Decision Service:  the national decision support platform for Scotland’s health and care

Website: https://rightdecisions.scot.nhs.uk    Mobile app download:  Apple  Android

 

 

Postpartum contraception (1162)

Warning

Objectives

This local guideline is based on the Faculty of Sexual & Reproductive Healthcare (FSRH) clinical guideline “Contraception after Pregnancy” 2017. 1  

It is to be used within NHS Greater Glasgow and Clyde (GGC) by medical and midwifery staff involved in the care of women during and after pregnancy. A TURAS module on Postpartum Contraception is also available.

This guideline will be used throughout Women and Children’s services to support decision making and ensure that all women are provided the best advice and access to contraception after pregnancy.

The recommendations within this guideline are intended to guide clinical practice but are not intended to serve alone as a standard of care or to replace clinical judgement in the management of individual women. 

Key areas of focus:

  • When should contraception be discussed?
  • Who should provide contraception to women after childbirth?
  • Which contraception method is most effective?
  • When can contraception after childbirth be initiated?
  • Which method of contraception is safe to use?
  • Method specific considerations.

2. Background

There are numerous studies that have shown that many unintended pregnancies occur within a year of a previous pregnancy.2,3 4

There is evidence that a short inter-pregnancy interval (less than 12 months) leads to poorer neonatal outcomes

The World Health Organisation (WHO) recommends an interval of 24 months after childbirth. 

Pregnancy is a unique opportunity to discuss contraception choices and reproductive intentions with women due to continued contact with healthcare services. 

3. Discussion and Provision of Contraception after Pregnancy

3.1 Available Methods

  • Recommended options for discharge from maternity services are:
    • Progestogen-only Implant (IMP). NexplanonTM (Etononogestrel) 68mg subdermal implant licensed for 3 years.
    • Progestogen-only Injectable (POI). DepoproveraTM (Medroxyprogesterone Acetate) 150mg IM every 13 weeks.
    • Progestogen-only Pill (POP). CerelleTM (Desogestrel) 75 micrograms daily.
    • Intrauterine Contraception (IUC). Provision of insertion of a coil at the time of a planned caesarean can be facilitated if the women has been appropriately counselled.
  • Other methods to consider:
    • Barrier Methods of contraception should be made available within the postnatal wards. They have an important role in reducing the risk of sexually transmitted infections (STI).
    • Female Sterilisation at caesarean. This remains an option however due to the irreversible nature, the standard guidance regarding decision making should be followed.
    • Combined Hormonal Contraception (CHC). CHC is not available for supply on discharge, as it should not be started until at least day 21 or 6 weeks for breast feeding women and women with additional VTE risk factors. Where this is the woman’s preference, the immediate discharge letter should include appropriate information to facilitate a prescription by the GP.
    • Emergency Contraception (EC) This is available from community pharmacies or via Sandyford (for advice and appointments phone 0141 211 8130 The line is open Mondays to Fridays from 8.30am - 4.15pm, except public holidays).

 

3.2  UK Medical Eligibility Criteria for Contraceptive Use (UKMEC)

  • When making a clinical decision on safety and appropriateness of a method of contraception, clinicians should refer to the relevant, up to date, FSRH guideline and the UK Medical Eligibility Criteria for Contraceptive Use (UKMEC)
  • The UK Medical Eligibility Criteria for Contraceptive Use (UKMEC) provides recommendations for the safety of different methods of contraception with regards to personal characteristics.
  • Personal characteristics that should be considered:
    • Patient preference/ previous contraceptive experience.
    • Age/ BMI/ smoking status.
    • Medical conditions e.g. malignancy, migraine, congenital heart disease.
    • Pregnancy related complications e.g. pregnancy induced hypertension, obstetric cholestasis, gestational diabetes.
    • Family history including thromboembolic mutations and carriers of gene mutations that predispose to malignancy.
    • Gynaecological history including uterine anomaly, previous pelvic infection and gestational trophoblastic disease.

Table 1: Definition of UK Medical Eligibility Criteria for Contraception Use (UKMEC) categories9

UKMEC

Definition

UKMEC 1

A condition for which there is no restriction for the use of the method.

UKMEC 2

A condition where the advantages of using the method generally outweigh the theoretical or proven risks.

UKMEC 3

A condition where the theoretical or proven risks usually outweigh the advantages of using the method. The provision of a method requires expert clinical judgement and/or referral to a specialist contraception provider. Use of the method is usually not recommended unless other more appropriate methods are not available or acceptable.

UKMEC 4

A condition which represents an unacceptable health risk if the method is used. 

  • UKMEC provides recommendations regarding safety of a method of contraception but do not indicate the most appropriate method for a woman or take into account efficacy.
  • Clinical judgement should be used when considering women with multiple co-morbidities.
  • Women with complex medical conditions who may require more specialist contraceptive advice can be discussed with Sandyford Sexual Health staff via the Professional Helpline or via switchboard and asking to speak to the CSRH Consultant on Call.
  • Women with pregnancy associated medical conditions are eligible for all methods of contraception as below:
    • Hypertension during pregnancy -  All methods UKMEC 1 except CHC UKMEC 2.
    • Obstetric cholestasis - All methods UKMEC 1 except CHC UKMEC 2.
    • Gestational diabetes - All methods UKMEC 1.
  • To contact the Sandyford for advice, email ggc.sandyfordprofessionalsupport@nhs.scot

 

3.3 Effectiveness of Contraceptive Method

  • During pregnancy women should be informed about the efficacy of different methods of contraception, including the superior efficacy of LARC methods.
  • Rates of unintended pregnancy are higher for methods which are user dependent methods of contraception (barrier, oral contraceptive pills).
  • Table 2 compares the typical and perfect use percentage of women who experience an unintended pregnancy during the first year of contraceptive use.

Table 2: Percentage of women experiencing an unintended pregnancy within the first year of use with typical use and perfect use10 Long-acting reversible contraceptive methods are in bold. 

Method

Typical Use (%)

Perfect use (%)

No method

85

85

Fertility Awareness-based Methods (FAM)

24

0.4-5

Female Diaphragm

12

6

Male Condoms

18

2

Combined Hormonal Contraception (CHC)*

9

0.3

Progestogen-only Pills (POP)

9

0.3

Progestogen-only Injectables (POI)

6

0.2

Copper Intrauterine Device (IUD)

0.8

0.6

Levonorgestrel-releasing Intrauterine System (IUS)

0.2

0.2

Progestogen-only Implant (IMP)

0.05

0.05

Female Sterilisation

0.5

0.5

Vasectomy

0.15

0.1

*  Includes combined oral contraception, transdermal patch and vaginal rings

 

3.4 Information Giving and Counselling 

  • When should contraception be discussed?
    • Contraception counselling should be ideally be initiated at any time after the booking appointment. The contraception guidance leaflet should be provided by 32 weeks and a decision should be documented by 36 weeks on Badgernet.
    • Care should be taken to ensure that women are informed of all available methods and that she is not pressured to choose a method.
    • Women should be informed about the efficacy of different methods of contraception, including the superior efficacy of long-acting reversible contraception (LARC).
    • Postpartum contraception information can be found on the Sandyford website:
  • Who should provide contraception to women after childbirth?
    • All staff involved in the care of pregnant women should offer the opportunity to discuss contraception. This information should be up-to-date and accurate.
    • Maternity services within GGC are able to provide all progestogen-only methods including implants, injectable and progestogen only pills before women are discharged from the service.
    • Please contact your area charge midwife for an up to date list of all staff trained in implant insertion.

 

3.5 Provision of Contraception

  • All appropriate methods of contraception should be available to women before they are discharged from the service.
  • Sufficient numbers of staff should be trained to provide implants to ensure that women who are medically eligible can initiate these immediately after pregnancy. Up to date records of staff trained in implant are available from all charge midwives.
  • Effective contraception should be initiated in breastfeeding and non-breastfeeding women as soon as possible as sexual activity and ovulation may resume soon after delivery. It is estimated that approximately 50% of women are sexually active 6 weeks following delivery.8
  • In non-exclusively breast feeding women this need is present after 21 days following delivery over 24 weeks.
  • Women should be advised that although contraception is not required in the first 21 days after delivery, most methods are safe to initiate immediately, with the exception of combined hormonal contraception (CHC).
  • Contraceptive need is present within 5 days following miscarriage, ectopic pregnancy and abortion.
  • If methotrexate is required for management of ectopic pregnancy or pregnancy of unknown location, women are recommended not to conceive within 3 months following the first dose.

 

 3.6 Record Keeping and Obtaining Valid Consent 

  • Staff should clearly document the discussion and provision of contraception.
  • The contraception plan should be clearly documented in BadgerNet under “Contraception”. Once a method has been selected, an alert should be added to her notes to ensure that this is provided prior to discharge.

4. Choosing a Suitable Method of Contraception

4.1  Suitable Methods of Contraception after Childbirth

Women can be advised that although contraception is not required until day 21 postnatal, most methods (with the exception of combined hormonal contraception) can be safely initiated immediately.  

Method

Timing of Insertion

Intrauterine Contraception (IUC) Cu- IUD and LNG-IUS

 

✔ Can be safely inserted immediately after birth, at the time of an uncomplicated caesarean or within the first 48hours after an uncomplicated vaginal birth UKMEC 1.

✔ After 48 hours, insertion should be delayed until day 28 post-natal UKMEC 1.

X   Contra-indicated in the presence of postpartum sepsis UKMEC 4.

X   Not recommended to fit between 48hours and 28 days after birth UKMEC 3.

Progestogen-only Implants (IMP)

✔ Safe to initiate any time after childbirth, including immediately after delivery (breastfeeding and non-breastfeeding) UKMEC 1.  

Progestogen-only Injectable (POI)

✔ Safe to initiate any time after childbirth, including immediately after delivery UKMEC 2.  

Progestogen-only Pill (POP) 

✔ Safe to start any time after childbirth, including immediately after delivery UKMEC 1.  

Combined Hormonal Contraception (CHC) 

X   If risk factors for VTE then should not be used within 6 weeks of childbirth. 

✔ If low risk for VTE and not breastfeeding, can be commenced after day 21 UKMEC 2.  

✔ If breastfeeding can be commenced after 6 weeks UKMEC 2.  

* Adapted from UK Medical Eligibility Criteria for Contraceptive Use (UKMEC) categories applicable to women after childbirth 

 

4.2 Breastfeeding and Contraception

  • Women should be informed that the available evidence indicates that progestogen-only methods of contraception have no adverse effects on lactation or infants.
  • If a woman is breastfeeding, she should wait until 6 weeks postnatal before initiating a CHC method.
  • There is limited evidence about the effect of CHC on breastfeeding. Studies looking at early initiation of CHC found no adverse effects on either breastfeeding performance or infant outcomes.

 

4.3 Lactation amenorrhoea method (LAM)

  • LAM is a highly effective method of contraception (less than 2% failure rate) if all of the following three criteria are fulfilled:
    • Less than 6 months postpartum,
    • Amenorrhoeic,
    • Fully breastfeeding.
  • Efficacy is reduced if the frequency of breastfeeding reduces (eg: increasing intervals between breastfeeding of >4 hours during the day and >6 hours at night, use of a dummy, increasing supplementary feeding or expressing milk), when menstruation returns or if over 6 months since childbirth.

 

4.4 Additional Contraception

  • If contraception is started immediately postpartum or within 21 days of childbirth additional contraceptive precautions (Eg: barrier method/abstinence) are not required.
  • However additional contraception precautions (Eg: barrier method/abstinence) are required if hormonal contraception is started 21 days or more after childbirth. Number of days of additional contraceptive precautions is dependent on the method of contraception started. See below table.

Methods of Contraception  

Initiation <21 days after Childbirth

Initiation >21 days after Childbirth

 

Number of days of additional contraceptive precautions required

Copper Intrauterine Device

 

None if inserted < 48 hours 

 

Insertion between 48 hours and <4 weeks may not be appropriate (UKMEC 3

None

Levonorgestrel-releasing Intrauterine System

7 days

Progestogen-only Pill 

None

2 days

Progestogen-only Implant or Injectable

None

7 days

Combined Hormonal Contraception 

Use not recommended 

7 days

 

4.5 Emergency Contraception (EC) after Childbirth 

  • EC is indicated if a woman has had unprotected sexual intercourse from day 21 after childbirth. It is not required prior to this.
  • Oral EC, Levonorgesterel 1.5mg (LNG-EC) and Ulipristal Acetate 30mg (UPA-EC) are safe to use from 21 days after childbirth.
  • If a woman is breastfeeding she should be informed that the limited available evidence indicates that LNG-EC has no adverse effect on breastfeeding.
  • If a woman is breastfeeding she should be advised to express and discard milk for one week after taking UPA-EC.
  • The Copper Intrauterine Device (Cu-IUD) can be safely inserted for EC from 28 days after childbirth.

5. Method Specific Considerations

5.1 Intrauterine Contraception (IUC)

  • IUC can be safely inserted immediately after birth or within the first 48 hours after an uncomplicated caesarean or vaginal birth. After 48 hours, insertion should be delayed until 28 days after birth.
    • Vaginal Birth – See attached Standard Operating Procedure entitled “Insertion of Post-Placental Intrauterine Contraception Following Vaginal Birth” for details regarding: eligibility, insertion technique, documentation and training.
    • Caesarean Birth – See attached Standard Operating Procedure entitled “Pathway for Women having Intra-uterine Contraception (IUC) fitted during Planned Caesarean Birth (PCB)” for further information regarding documentation and referral to Sandyford for follow up.
  • Clinicians should clearly document the type of device inserted in BadgerNet (e.g. hormonal: LevosertTM, MirenaTM or non-hormonal: T-safe Cu 380A QL or TT380).
  • There is no evidence of increased risk of uterine perforation if IUC is inserted immediately after delivery of the placenta or within 48hours of delivery, compared with delayed insertion (after 4 weeks).
  • There is no increased risk of infection.
  • The insertion of IUC immediately after childbirth is associated with higher rates of expulsion but also higher continuation rates 6-12 months postpartum regardless of type of IUC or mode of birth. Expulsion is most likely to occur within the first 3 months after insertion.
    • Caesarean Birth – Expulsion rate – Immediate insertion 10% vs Interval insertion 5%.
    • Vaginal Birth – Expulsion rate – Immediate insertion 24% vs Interval insertion 4.4%.

Sandyford have agreed to provide follow up. Women will be telephoned by the Sandyford team to arrange.

 

5.2 Progestogen-only Implant (IMP)

  • Insertion of the implant immediately after childbirth is currently out with its product licence, however, studies have shown that insertion at this time is safe and highly acceptable to women. Therefore the FSRH are supportive its use immediately postpartum.
  • All women should be supplied with the patient information leaflet “Advice following insertion of a contraceptive implant leaflet”. This is available in all postnatal wards and can also be accessed via the following link :
    https://www.sandyford.scot/media/3804/317849_1_0-advice-following-insertion-of-acontraceptive-implant-leaflet-final.pdf

 

5.3 Progestogen-only Injectable (POI)

  • POI can be started at any time after childbirth, including immediately after.
  • There is theoretical concern that the use of DMPA may be associated with an increased risk of VTE compared to other progestogen-only methods. The progestogen only injection is therefore classified as UKMEC 2 for use by women in the first 6 weeks after childbirth.
  • There are two available preparations:
    • Depo- ProveraTM – administered intramuscularly.
    • Sanya PressTM – administered subcutaneously.

NB: Only Depo-ProveraTM is available on postnatal wards in GG+C at present.

 

5.4 Progestogen-only Pill (POP)

  • POP can be started at any time after childbirth, including immediately after delivery.
  • Desogestrel 75 micogram tablets – CerelleTM is available on postnatal wards in GG+C.

 

5.5 Combined Hormonal Contraception (CHC)

  • All women should undergo a VTE risk assessment postnatally. CHC should not be used by women who have risk factors for VTE until 6 weeks postnatal (UKMEC 4). This applies to both women who are breastfeeding and not breastfeeding.
  • Women who are not breastfeeding and are without any additional risk factors for VTE should wait until 21 days after childbirth before initiating a CHC.
  • In women who are breast feeding it is recommended that commencing a CHC should be delayed until 6 weeks postpartum to allow breastfeeding to establish.
  • Combined hormonal contraception should not be supplied on discharge, however, if desired a bridging method of contraception should be considered.

 

5.6 Female Sterilisation

  • Female sterilisation is a safe and permanent option for contraception after childbirth.
  • Both FilshieTM clips and modified Pomeroy technique are effective.
  • Women should be made aware that some LARC methods are as, or more effective than female sterilisation and may also offer non-contraceptive benefits.
  • Women who opt for tubal occlusion should be made aware that they need to seek medical advice in the event of a pregnancy as they will be more likely to have an ectopic pregnancy.
  • Women requesting sterilisation at the time of caesarean birth should be advised of the possible increased risk of regret compared to interval sterilisation.
  • Written consent for sterilisation at caesarean birth should be obtained and documented at least 2 weeks prior to the planned caesarean birth.

 

5.7 Male Sterilisation

  • Vasectomy should be discussed with all people requesting sterilisation. Individuals should be informed that some LARC methods are as effective as sterilisation and may offer some non-contraceptive benefits.
  • They should be advised that vasectomy is associated with a lower failure rate, is quicker and associated with less morbidity than laparoscopic sterilisation.11
  • A negative ejaculate specimen is required to confirm that a vasectomy is effective. This can take up to 12 months and it is important that women are counselled about their on-going need for contraception during this time.
  • An appointment to discuss a vasectomy can be made at Sandyford Central and does not require GP referral.

 

5.8 Barrier Methods

  • Male and female condoms can be safely used by women after childbirth.
  • If using a diaphragm, women should be advised to wait at least 6 weeks after childbirth before fitting as the size required may change as the uterus involutes.

 

5.9 Fertility Awareness Methods (FAM)

  • Can be used after childbirth.
  • Women should be advised that as FAM relies of the detection of signs and symptoms of ovulation its use may be difficult after childbirth and when breastfeeding.

Editorial Information

Last reviewed: 28/08/2024

Next review date: 28/08/2027

Author(s): Helena Young , Catriona Bain, Rachel Hepburn.

Version: 1

Approved By: Maternity Governance Group

References
  1. Faculty of Sexual and Reproductive Health. Contraception after Pregnancy. 2017 
  2. Bexhell H, Guthrie K, Cleland K, et al. Unplanned pregnancy and contraceptive use in Hull and East Yorkshire. Contraception Published Online First: 28 October 2015.
  3. Lakha F, Glasier A. Unintended pregnancy and use of emergency contraception among a large cohort of women attending for antenatal care or abortion in Scotland. Lancet 2006;368:1782–1787.
  4. Young H. Short interval pregnancies Glasgow. 2018 (unpublished)
  5. Heller R, Cameron S, Briggs R, et al. Postpartum contraception: a missed opportunity to prevent unintended pregnancy and short inter-pregnancy intervals. J Fam Plann Reprod Health Care 2016;42:93–98
  6. Smith GCS, Pell JP, Dobbie R. Interpregnancy interval and risk of preterm birth and neonatal death: retrospective cohort study. Br Med J 2003;327:313.
  7. World Health Organization (WHO). Report of a WHO Technical Consultation on Birth Spacing. 2007. 
  8. McDonal E, Brown S. Does method of birth make a difference to when women resume sex after childbirth. BJOG 2013; 120.
  9. Faculty of Sexual & Reproductive Healthcare (FSRH). UK Medical Eligibility Criteria for Contraceptive Use (UKMEC). 2016.
  10. Trussell J. Contraceptive efficacy. In: Hatcher R, Trussell J, Nelson A, et al. (eds), Contraceptive Technology. New York, NY: Ardent Media, 2011.
  11. Faculty of Sexual and Reproductive Health. Male and Female Sterilisation. 2014.