As for diagnosis, a person is diagnosed with Marfan syndrome if they have clinical features of Marfan syndrome like aortic disease, a dislocated lens, family history, and FBN1 mutations.

在诊断方面，要确诊马方综合征可通过以下方法：患者有明显的马方综合征临床特征，比如主动脉疾病、晶状体脱垂、家族史以及FBN1基因突变。