Clinical use
Gestational Age interpretation support
Ultrasound gestational age from CRL, BPD, and femur length.
- Biometric formulas here are practical approximations intended for quick educational use.
Body imagingCondensed pathway
Gestational Age
Ultrasound gestational age from CRL, BPD, and femur length.
This tool summarizes the major published branches or formulas and may omit edge cases from the full source guideline.
- Biometric formulas here are practical approximations intended for quick educational use.
CRL
BPD
Femur length
Result
Fill in the visible inputs to calculate a result.
References
Fetal crown-rump length: reevaluation of relation to menstrual age (5-18 weeks) with high-resolution real-time UShttps://pubmed.ncbi.nlm.nih.gov/1732970/
Fetal biparietal diameter: a critical re-evaluation of the relation to menstrual age by means of real-time ultrasoundhttps://pubmed.ncbi.nlm.nih.gov/6152941/
Fetal femur length as a predictor of menstrual age: sonographically measuredhttps://pubmed.ncbi.nlm.nih.gov/6979176/
Citations open in a new tab when the URL is valid http(s); the decision logic itself still runs locally in the browser.