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Pretest odds

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

  • this is defined as the odds that the patient has the target disorder before the test is undertaken
    (pretest probability/[1-pretest probability])

Note that pretest probability is defined as

([a+c]/[a+b+c+d])

where:

target disorder present

target disorder absent

test result positive

a

b

test result negative

c

d

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