| Governing Body |
Recommendations |
| The Society of Gynecologists of Canada
(SGOC) (21) |
Embryo >5 mm and absent fetal cardiac activity |
| Intrauterine mean gestational sac diameter >8 mm with absent yolk sac |
| Intrauterine mean gestational sac diameter >16 mm without fetal pole |
| The American College of Radiologists
(ACR) (22) |
Embryonic crown-rump length >5 mm and absent fetal cardiac activity |
| Royal College of Obstetricians and Gynaecologists (RCOG)
and
Royal College of Radiologists (RCR)
(23) |
Intrauterine gestational sac with mean diameter ≥ 20 mm and no yolk sac |
| Fetal crown-rump length ≥ 6 mm with absent fetal cardiac activity |
| Australasian Society for Ultrasound in Medicine (ASUM)
(24) |
Mean gestational sac diameter ≥ 20 mm with absent embryonic structures |
| Embryonic crown-rump length ≥ 6 mm with absent fetal heart rate |
| Institute of Obstetricians and Gynaecologists, Royal College of Physicians of Ireland
(25) |
Mean gestational sac diameter >20 mm with absent embryonic structures (embryo or yolk sac) |
| Embryonic crown-rump length ≥ 7 mm with absent fetal heart rate |
