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Number Needed to Screen (NNS)

Purpose:

To identify the number of people in a target population who need have genetic screening in order to prevent 1 person from developing disease.

Specialty:

Genetics

Objective:

clinical diagnosis, including family history for genetics, other testing

ICD-10:

Description:

The Number Needed to Screen (NNS) is the number of people in a population who need to be screened for a genetic disorder in order to prevent 1 person from being affected. This is an extension of the Number Needed to Treat (NNT, see chapter on Decision Analysis).

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