False Positive Test(F.P.)

• Increases as more tests are performed on a patient

• % chance of F.P. = 100 - (0.95n X 100)

  n - # tests performed on a patient
  

• e.g.,6 tests ordered on a normal person - a 27% chance of a result falling outside the normal range

(100 - (0.956 X 100)

20 tests ordered bring a 64% chance of an abnormal result.

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