EpistemisGestational Age and Naegele's Rule
Calculates the Probable Date of Delivery (PPD) based on the date of the last period (LMP) using the classic Naegele formula:
Required inputs
| Variable | Example value |
|---|---|
| First Day of the Last Menstrual Period (LMP) | 2025-01-15 |
| Is a First-Trimester Ultrasound Available? | — |
| Ultrasound Date | 2025-03-01 |
| Crown-Rump Length (CRL) (mm) | — |
Run the calculation in the app
This page explains the score but does not run it. In Epistemis, the calculator validates units, flags values outside physiological ranges, and provides the interpretation that a number alone cannot convey.
Epistemis is educational review material. It is not a medical device, does not diagnose or prescribe treatment, and does not replace formal medical training, current clinical guidelines, or professional clinical judgment.
- Specialty
- Gynecology and Obstetrics
- Area
- Specialties
- Variable phases
- 4