For a referral for a 20-week screening ultrasound during pregnancy contact your doctor or midwife. For more information about fetal ultrasounds visit the pregnancy and baby page at ...

The time from invasive testing to diagnosis can be lengthy and may not change the outcome of the pregnancy, especially if the ultrasound appearance of the chest suggests lethality. A positive ...

First-trimester physical examination ±2 weeks ... days (20 x 7 + 2) 4. Multiply this number by 0.08 for the 8% MOE 142 days x 0.08 = MOE 11.36 5. If the difference is greater, use the ultrasound ...