Quality Assurance Quiz

Which stage of quality assurance involves specimen collection and patient identification?

• Analytical

• Preanalytical

• Postanalytical

• Diagnostic

What is the purpose of a T-test?

• To determine if there is a significant difference between the standard deviations of two groups.

• To monitor results from control samples.

• To determine if there is a significant difference between the means of two groups.

• To measure the concentration of an analyte.

According to the "68-95-99 Rule," approximately what percentage of data falls within +/- 2 standard deviations of the mean in a Gaussian distribution?

• 68%

• 95%

• 99%

• 100%

Which term describes the closeness of assayed values to the true value?

• Precision

• Reliability

• Practicability

• Accuracy

What is the minimum number of healthy subjects required to establish a new reference interval?

• 20

• 68

• 95

• 120

In a Levey-Jennings chart, what does it mean when six consecutive control values are on the same side of the mean?

• Random error

• Shift

• Trend

• Outlier

Which Westgard rule is considered a "warning flag"?

• 13S

• 22S

• R4S

• 12S

Which type of error is described as influencing all observations consistently in one direction?

• Random error

• Systematic error

• Trend

• Outlier

What is the most common light source for work in the visible and near-infrared regions of a spectrophotometer?

• Deuterium lamp

• Hollow-cathode lamp

• Xenon lamp

• Tungsten iodide lamp

Which component of a spectrophotometer is used to isolate a specific wavelength of light?

• Light source

• Sample cell

• Monochromator

• Photodetector