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Tuesday, March 11, 2008

Sensitivity helps in Ruling OUT a disease Specificity helps in ruling IN a disease

064. Study the following table carefully and answer the following question:

Disease

Test result

Present

Absent

+

40

225

-

10

225

What is the sensitivity of diagnostic test?

1. 45

2. 20

3. 80

4. 50

Answer

3. 80

Reference

Park 18th Edition Page 117

Quality

Thinker

Status

Repeat

QTDF

All Books

Discussion

True Positive

Sensitivity

=

-------------------------------------

x100

True Positive +False Negative

Explanation

40

Sensitivity

=

---------

x100

40 +10

40

=

-----

x100

50

=

80

Comments

Almost all exams have one question from these formula

Tips

Sensitivity helps in Ruling OUT a disease - SNOUT

Specificity helps in ruling IN a disease - SPIN

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