Fetal growth retardation or macrosomia may be missed or incorrectly diagnosed owing to errors in gestational age assignment.
Interpretation of antenatal biophysical testing (non-stress tests and biophysical profiles) may be subject to variation with gestational age as well.
The SFH is measured using a tape placed over the mother's abdomen.
Sometimes it is requested by a doctor or midwife to confirm that your pregnancy is healthy (in this case your scan is often called a viability scan) and to calculate the date when your baby is due (usually referred to as a dating scan).
The distance from the top of the pubic bone (symphysis pubis) to the top of the pregnant uterus (fundus) is measured in centimeters (cm).
The SFH in centimeters should be equal to the gestational age in weeks.
Again, inaccurate assessment of gestational age will lead to errors in assessing the severity of fetal sensitization by the delta OD 450.
Fetal growth assessment, either clinically or by ultrasound evaluation, also relies on accurate assessment of gestational age.
If the nub is angled greater than a 30 degree angle in relation to the spine, it is likely a male fetus.