In quality control plotting, what is the purpose of the Percent Coefficient Variation?

• A. To measure accuracy
• B. To express precision
• C. To adjust standards
• D. To limit errors

Answer: (B)

The Percent Coefficient of Variation is a critical metric used in quality control to express precision. It is calculated by taking the standard deviation of a data set, dividing it by the mean, and then multiplying by 100 to get a percentage. This value provides insight into the relative variability of the data concerning its mean. The smaller the percent coefficient of variation, the more consistent and reliable the measurements are considered to be.

In bone densitometry, maintaining high precision in measurements is crucial for accurately assessing bone health and diagnosing conditions such as osteoporosis. By using the Percent Coefficient of Variation, technicians can evaluate the variation in their readings, allowing for adjustments to be made in practice or technique if necessary. This ultimately contributes to the quality and reliability of diagnostic outcomes in patients.