: A Z-score ≥ 3.0 is required for a positive finding, or a Z-score ≥ 2.0 if other criteria are met .
To ensure Z-score accuracy, the measurement must be standardized. Current guidelines recommend measuring the aortic root at the level of the sinuses of Valsalva, specifically from inner edge to inner edge (or leading edge to leading edge depending on the specific protocol used by the reference study) during end-diastole. Inconsistencies in measurement technique are the primary source of inter-observer variability in Z-score calculation. marfan syndrome z score
Marfan Syndrome: A Summary of Genetic Causes and Ghent Criteria : A Z-score ≥ 3
Medical professionals typically use specialized calculators, such as those provided by the Marfan Foundation , to input measurements from an echocardiogram or CT scan . The score represents how many standard deviations the patient's measurement is from the mean . marfan syndrome z score