Cardiac dimensions, valves, great vessels & function · evidence-anchored Z-scores · fetal-echo.org
Clinical decision-support aid — not a diagnostic test. Z-scores are computed from published reference
equations and are valid only within the gestational-age / weight range of each source. Always interpret
alongside serial measurements, image quality and the wider clinical picture. Assumes a singleton,
structurally evaluated fetal heart.
Patient & biometry
Enter biometry once — every calculator below uses it. Name and ID are optional and only used to label a printout.
Biometric inputs
Findings & interpretation
Parameters that fall outside the reference range are flagged here, most abnormal first.
|Z| ≥ 2 = outside the 95% range (red); |Z| 1.5–2 = borderline (orange).
Enter measurements above — flagged results will appear here.
Patient name and ID are used only to label this printout on your own device. They are
not transmitted, saved, or stored in any database. The study date is added automatically.