These individuals are typically myopic, because the shape of the eyeball is elongated. Their skin often has bluish stria. Asymmetric pectus excavatum, or pectus carinatum, is common. A different physical appearance unrelated to Marfan syndrome should alert you to the possibility of coarctation of the aorta. These patients have an upper body noticeably more developed than the lower body, because their legs did not grow normally.
Blood pressure taken by a nurse is more likely to be accurate.
Also, use the proper size cuff. A big athlete needs a big cuff. Truly elevated blood pressure should be evaluated further and treated accordingly before athletic participation is approved. If blood pressure is elevated, take the radial and femoral pulse simultaneously. Femoral pulse delay is a sign of coarctation of the aorta.