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#1
12-04-2010
 USMLE Forums Scout Steps History: Not yet Posts: 81 Threads: 51 Thanked 41 Times in 17 Posts Reputation: 40
Positive Predictive Value Versus Sensitivity

What situations would it be best to use ppv? what situations would it be better to use sensitivity as a measurement value? Arent't they both relatively similar to one another
 The above post was thanked by: drzamzam (08-17-2015)

#2
12-04-2010
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 742 Threads: 137 Thanked 2,428 Times in 441 Posts Reputation: 2531
Here's the difference

Example:
You test your patient and you found him HIV positive. He comes and asks you what are the chances that the test is correct, you then tell him the PPV rate of the test. You can't tell him the sensitivity.

So PPV is a post test probability. The probability that you truly have the disease when the test is positive.

While sensitivity is a pre test probability. It's how good the test in ruling out people with the disease (less false negatives).
 The above post was thanked by: ashishkabir (12-04-2010), drzamzam (08-17-2015), JaJeeK (12-04-2010), Pixie (12-04-2010), Salwa2013 (12-03-2013)

 Tags Biostatistics-Epidemiology

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