The calculator assigns points based on specific physical manifestations: Marfan Foundation Calculation of Systemic Score - Marfan Foundation

To use the calculator, a physician inputs data from a physical exam and imaging. Points are assigned as follows:

Older calculators relied heavily on height-to-arm span ratios. Modern guidelines (2010 revision onwards) prioritize the aortic root Z-score . You cannot self-diagnose Marfan syndrome with a tape measure alone; you need an echocardiogram.

A positive test for a mutation in the (Fibrillin-1) is a major criterion.

The MSC score provides a rapid and accurate assessment of the likelihood of Marfan syndrome, facilitating diagnosis and management.