asmi
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The American Diabetes Association (ADA) recently lowered the cutoff
value for fasting glucose used in diagnosing diabetes mellitus from
140 mg/dL to 126 mg/dL. This reference interval change would be expected
to produce which of the following alterations?
A. Decrease the test's sensitivity
B. Increase the test's false negative rate
C. Increase the test's negative predictive value
D. Increase the test's positive predictive value
E. Increase the test's specificity
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| mjl1717
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positive predictive value
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Smell the coffee! "Is That an Osler move??"
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| asmi
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correct
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| peekay
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asmi could u please provide the explanation. i was unable to exclude in one minute
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| asmi
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* A test's sensitivity is inversely related to its specificity.
*lowering a test's upper limit of normal , increases the test's sensitivity,which decreases the FN( false negative) rate and increases the PV-( negative predictive value),decreases the test's specificity,increases the FP(false positive) rate and decreases the PV+( postitve predictive value)
HINT: to remember better :
100% sensitivity , no FN's , PV- is 100%
100% specificity , no FP's , PV+ is 100%
I know its very boring and stupid 
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| peekay
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thanks for the explanation. i will try to understand it better. that was a very real exam like qs. as u are aware, they know we know these formulas but problem comes when they ask question about their interpretation.
I guess more practice we will help me
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| asmi
Forum Hero
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yes you r right peekay.
I have got an idea :idea: , let all of us post such stupid tricky Q's ,so that it become easy for all .
Lets do it !! Each day one question from everyone on beh. sciences and that too related to tough Q's .
Any suggestions r welcome .
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| usmleasr
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good q
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| dr.shar
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good memonic asmi
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