## What is the meaning of Biparietal diameter?

BPD (biparietal diameter), the diameter of your baby’s head. HC (head circumference), the length going around your baby’s head. CRL (crown-rump length), the length from the top of the head to your baby’s bottom, measurement taken in the first trimester.

## What is normal bpd in pregnancy?

Your doctor is looking for the BPD measurement, as well as the other measurements, to be within what is considered normal range. The biparietal diameter measurement increases from roughly 2.4 centimeters at 13 weeks to approximately 9.5 centimeters when a fetus is at term.

**What is the normal BPD at 26 weeks?**

The growth rate of BPD was 3.9mm/week between 13 and 16 weeks, 3.1mm/week between 17 and 25 weeks, 2.5mm/week between 26 and 29 weeks, 2.1mm/week between 30 and 33 weeks, and 1.6mm/week between 34 and term.

### What is the difference between BPD and HC?

Biparietal diameter (BPD) is one of the basic biometric parameters used to assess fetal size. BPD together with head circumference (HC), abdominal circumference (AC), and femur length (FL) are computed to produce an estimate of fetal weight.

### What is AC in pregnancy?

Abdominal circumference (AC) is one of the basic biometric parameters used to assess fetal size. AC together with biparietal diameter, head circumference, and femur length are computed to produce an estimate of fetal weight.

**What is CRL and BPD?**

Three-hundred fetal crown-rump length (CRL) measurements in the range 10-80 mm and 245 measurements of biparietal diameter (BPD) in the range of 17-50 mm were obtained in a longitudinal study of 105 pregnancies. The width of the 95% prediction interval for age estimates was established for 10 mm ranges of CRL and BPD.

## What is normal HC AC ratio?

Between 20 and 36 weeks of gestation, the HC/AC ratio normally drops almost linearly from 1.2 to 1.0. The ratio is normal in the fetus with symmetric growth restriction and elevated in the infant with asymmetric growth restriction.

## What is FL in pregnancy?

Femur Length (FL) – measures the length of the thigh bone If the fetal weight estimate is below the bottom 10 per cent line on the graph, it is considered to be small for gestational age (SGA). If the fetal weight is above the top 10 per cent line on the graph, it is considered to be large for gestational age (LGA).