1. Enter the best gestational age of the fetus in weeks.

2. Enter the the measurements (mm) you obtained on ultrasound for each of the parameters you measured.
 

3. Press

Evaluate

4. The form will calculate the percentile for each of your measurements for the gestational age you entered.

5. The form will then generate a table of your measurements including the percentiles and standard deviations.

6. If the pattern matches a particular dysplasia, the calculator will suggest possible diagnoses.