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Criteria for Failed Pregnancy in Woman with Intrauterine Pregnancy

Purpose: To identify a pregnant woman with a failed intrauterine pregnancy on transvaginal ultrasonography.

Description

Criteria for identifying a failed pregnancy in a woman with an intrauterine pregnancy using transvaginal ultrasonography were defined by at the Society of Radiologists in Ultrasound Multispecialty Consensus Conference on Early First Trimester Diagnosis of Miscarriage in 2012.


 

Patient selection: pregnant woman with intrauterine pregnancy of uncertain viability

 

Imaging: transvaginal ultrasonography

Parameter

Suspicious for

Diagnostic for

crown-rump length and heartbeat

< 7 mm AND no heartbeat

>= 7 mm AND no hearbeat

mean gestational sac diameter and embryo

16-24 mm AND no embryo

>= 25 mm AND no embryo

gestational sac without yolk sac

absence of embryo with heartbeat 7-13 days after scan showing sac

absence of embryo with heartbeat >=14 days after scan showing sac

gestational sac with yolk sac

absence of embryo with heartbeat 7-10 days after scan showing sac

absence of embryo with heartbeat >= 11 days after scan showing sac

absence of embryo

>= 6 weeks after last menstrual period

NA

amnion

empty

NA

yolk sac diameter

> 7 mm (enlarged)

NA

different between gestational sac diameter and crown-rump length

< 5 mm

NA

 

where:

• The amnion is adjacent to the yolk sac.

 

difference between gestational sac diameter and crown-rump length =

= (mean gestational sac diameter in mm) - (crown-rump length in mm)

 

If the findings are suspicious for a failed pregnancy then repeat ultrasonography in 7-10 days.

 


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Specialty

Objective

ICD-10