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Re:Experimental blood test detects cancer up to four years b... by hn_throwaway_99 on Wednesday July 22, 2020 @09:54AM (#23916985)
The wiki article on positive predictive value has the formula for calculating it based on the sensitivity and specificity of a test, and the prevalence:

https://en.m.wikipedia.org/wiki/Positive_and_negative_predic...

Re:Experimental blood test detects cancer up to four years b... by bananaface on Wednesday July 22, 2020 @10:40AM (#23917495)
Perfect! Thank you.