Gorlin Valve Area

Name: Gorlin Valve Area
Creator: Daniel Diaz-Gil, MD
Keywords: Gorlin, valve area, aortic valve area, mitral valve area, AVA, MVA, Hakki, valve stenosis, cardiac catheterization, gradient, hemodynamics

Calculates aortic or mitral valve area using the Gorlin formula and Hakki simplified method

Clinically Verified· 5 tests

For educational and informational purposes only. Verify all results before clinical application.

Valve *

Cardiac Output *

L/min

Heart Rate *

bpm

Systolic Ejection Period (SEP) / Diastolic Filling Period (DFP) *

sec/beat

For aortic valve: systolic ejection period (sec/beat). For mitral valve: diastolic filling period (sec/beat). Measured from catheterization tracings.

Mean Gradient *

mmHg

Body Surface Area (m²)

m²

Optional: enter BSA for indexed values Body Surface Area (BSA)

References

Gorlin R, Gorlin SG. Hydraulic formula for calculation of the area of the stenotic mitral valve, other cardiac valves, and central circulatory shunts. Am Heart J. 1951;41(1):1-29.[DOI]
Hakki AH, Iskandrian AS, Bemis CE, et al. A simplified valve formula for the calculation of stenotic cardiac valve areas. Circulation. 1981;63(5):1050-1055.[DOI]

Reviewed by Daniel Diaz-Gil, MD · Last updated March 2026

Medical disclaimer

This tool is for educational and informational purposes only. It is not a substitute for professional clinical judgment. Always independently verify results before making clinical decisions.

Professional Resources — Tools used by pediatricians for valve area calculation

Grossman's Cardiac Catheterization HandbookEssential hemodynamic assessment and cath lab reference~$70via Amazon Hemodynamic Rounds, KernCase-based hemodynamic interpretation for the cath lab~$70via Amazon Park's Pediatric Cardiology for Practitioners, 7th EdComprehensive reference for pediatric cardiology evaluation and management~$95via Amazon