- Gestational Age:
Age of the pregnancy, in completed weeks and days
- Biparietal Diameter (BPD):
Distance between the two parietal bones of the fetal skull (outer to inner), in millimeters
- Head Circumference:
Measurement of the fetal head at its widest, in millimeters
- Abdominal Circumference: Measurement of the fetal abdomen, in millimeters
- Femur Length: Length of the fetal thigh bone, in millimeters
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![Illustration of the four measurements on a baby’s body: femur length, abdominal circumference, head circumference, and biparietal diameter.](https://www1.nichd.nih.gov/fetalgrowth-calculator/PublishingImages/FetalGrowthCalculator-Definitions-Image.jpg) |