Non-continuing pregnancy diagnosis (900)

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Ultrasound diagnosis of miscarriage should only be considered when:

  • Mean Gestation Sac Diameter >/= 25mm (with no obvious yolk sac) on Transvaginal scan
  • A fetal pole with Crown Rump Length (CRL) >/= 7mm on Transvaginal scan (without evidence of fetal heart activity)
  • A fetal pole with Crown Rump Length (CRL) >/= 32mm on Transabdominal scan (without evidence of fetal heart activity)

A second Sonographer (with at least one year’s post competency experience) MUST physically rescan the woman to confirm the diagnosis. If this is not possible on the same day, then another scan should be performed by a DIFFERENT Sonographer at a time that suits patient/department. If the scan needs to be performed by the SAME sonographer, there must be an interval of at least one week from the initial scan before it is repeated.

Sonographers MUST ensure the name and authorisation boxes are completed on BadgerNet.

In all cases, where there is any doubt about the diagnosis and/or a woman requests a repeat scan, this should be performed at an interval of at least one week from the initial scan before medical or surgical measures are undertaken for uterine evacuation.

Editorial Information

Last reviewed: 05/10/2023

Next review date: 31/10/2028

Author(s): Dr Lynne Thomson, Consultant O&G, QEUH.

Version: 2

Co-Author(s): Victoria Murray, Lead Sonographer O&G, QEUH.

Approved By: Gynaecology Clinical Governance Group

Document Id: 900