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Definition of Index case

Index case: A person who first draws attention to his or her family because of having a medical condition. For example, if an eye doctor discovers a person has glaucoma, and subsequently other cases of glaucoma are found in the person's family, that person is the index case. Also known as propositus (if male) or proposita (if female).

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=3965
Last Editorial Review: 3/19/2012

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