Measurement | Number of participants | Crown-rump length (without cardiac activity) | FPR | Mean gestational sac diameter | FPR |
Initial studies[1,2] | 707 consecutive pregnancies | 5 mm | Not available | 16 mm | Not available |
2011 prospective cross-sectional study[3] (less stringent) | 1060 total consecutive patients | 6 mm | 0 | ≥21 mm | 0 |
2013 Society of Radiologists in Ultrasound[4] (more stringent) | Combination of the previous studies | 7 mm | 0 | ≥25 mm | 0 |
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