If you are a patient looking for your own risk assessment, please ask your doctor to provide the from their software. If you are a sonographer seeking login access, please complete the FMF certification at fetalmedicine.org .

The Fetal Medicine Foundation Nuchal Translucency calculator is a valuable tool in the field of fetal medicine, providing a more accurate estimation of the risk of chromosomal abnormalities. While it has its limitations, the calculator has become an essential part of first-trimester screening protocols. Healthcare providers must follow strict guidelines to ensure accurate measurements and minimize variability. By understanding the benefits and limitations of the FMF NT calculator, healthcare providers can provide better care and counseling to their patients.

If you are a member, log in at: (under "Members" -> "Risk Calculation" or via the "FMF Beta" app on iOS/Android).

| Item | Details | | :--- | :--- | | | Restricted to FMF-certified members only. | | Key Inputs | Maternal age, CRL, NT, PAPP-A (MoM), free β-hCG (MoM), ethnicity, smoking. | | Output | Trisomy 21, 18, 13 risks; NT MoM. | | Public Alternative | Perinatology.com (for estimation only, not clinical use). |

The FMF provides a specific, proprietary calculator for , which combines NT measurement, maternal age, and maternal serum biomarkers (free β-hCG and PAPP-A) to calculate the risk for Trisomy 21 (Down syndrome), Trisomy 18, and Trisomy 13.

Whether you are a doctor calculating a 1 in 5,000 risk or a parent receiving a 1 in 50 result, remember: the number is only as good as the calculator that generated it. Trust the gold standard. Trust the FMF.