Start with patients who may or may not have the disease.
Perform the test you're studying and a "gold standard" test that
distinguishes between disease(+) and disease(-) patients.
Compare the results of the study test with the "gold standard" test.
Start with patients who have the disease (diagnosis based on some
Measure baseline characteristics.
Measure outcomes over time over time.
See if some of the baseline characteristics predict outcomes.
On 20-Feb-09, at 14:21 , Steve Simon wrote:
> Maybe this is a stupid question, but here goes.
> What is the difference between a diagnostic study and a prognostic
> study? Is it that diagnostic study examines one of more factors that
> can help identify an already existing condition whereas a prognostic
> study examines one of more factors that can predict a future
> condition? Is it that diagnosis is targeted towards something bad
> (disease) while prognosis is targeted towards something good
> (recovery)? Or is it something else?
> Steve Simon, Standard Disclaimer.
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