Introduction
to Clinical Laboratory Testing
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Practice problems ---
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- The normal range for
fasting serum glucose is 70 - 110 mg/dl. If 1,000 normal
people are tested, how many results will be
within the normal range?
- The mean for a
laboratory serum glucose control specimen is 80 mg/dl and
the standard deviation is 2.0 mg/dl. What is the 95%
confidence interval for the result?
- What is the C.V. for
the glucose determination in item 2.0 above?
- What is the 95%
confidence interval for a serum glucose determination
reported as 250 mg/dl when the C.V. is 2.0% ?
- A new test for
diagnosing diabetes mellitus is devised and evaluated from
the following:
- 98 of 100
individuals known to be diabetic tested positive.
- 198 of 200
individuals known not to be diabetic tested negative.
- What is the
sensitivity of the test?
- What is the
specificity of the test?
- What is the
predictive value of a positive test result when
the prevalence of DM is 1%. (repeat for prevalence=0.1% and 10 %)
- What is the
probability that a negative test result provides
an accurate diagnosis?