Table 1.

Details of the OBUS training course.

Didactic curriculum for OBUS educational module	Time
Mechanics of transabdominal and transvaginal OBUS	5 minutes
Normal US findings in 1st trimester pregnancy	10 minutes
US findings in ectopic pregnancy	10 minutes
Other abnormal US findings in early pregnancy (fetal demise, molar pregnancy)	10 minutes
Determining EGA by CRL	5 minutes
Measuring FHR using M-mode	5 minutes
Fetal biometry in later pregnancy (biparietal diameter, head circumference, abdominal circumference, femur length)	10 minutes
Determination of fetal lie	5 minutes
Hands-on US practice with live models	120 minutes
1 station TV, non-pregnant
1 station TA, non-pregnant
1 station TA, pregnant
1 testing station TA, pregnant

OBUS, obstetrical ultrasound; US, ultrasound; EGA, estimated gestational age; CRL, crown-rump length; FHR, fetal heart rate; TV, transvaginal; TA, transabdominal