According to the revised Ghent Nosology (the international guidelines for diagnosing Marfan), the threshold for diagnosis is typically a Z-score of .
You don't need to do the math yourself, but understanding the inputs helps you advocate for your health. z-score marfan
The formula takes your aortic diameter (in mm) and compares it to a database of healthy people. To get an accurate score, your doctor needs accurate inputs: According to the revised Ghent Nosology (the international
4 indicates severe aortic root dilatation and body size (e.g.
The expected aortic root diameter is based on nomograms or reference tables that take into account the individual's age, sex, and body size (e.g., body surface area). The standard deviation of the expected aortic root diameter is also used to calculate the z-score.