Given the Following Precision Study Results for an Automated Prothrombin

question 37

Multiple Choice

Given the following precision study results for an automated prothrombin time procedure: $\begin{array}{l}\text { Precision Study }\\\begin{array}{|l|l|l|l|}\hline & \text { Level 1 } & \text { Level 2 } & \text { Level 3 } \\\hline \text { Mean } & 10.5 \mathrm{sec} & 12.1 \mathrm{sec} & 19.4 \mathrm{sec} \\\hline \text { SD } & 0.06 & 0.18 & 0.17 \\\hline \text { CV } & 0.6 \% & 1.5 \% & 0.9 \% \\\hline \text { Manufacturer's } & & & \\ \text { CV } & 0.8 \% & 1.1 \% & 1.1 \% \\\hline\end{array}\end{array}$
Which is the appropriate interpretation?

• A) Precision study results are acceptable.No random error was detected.
• B) Precision study results are unacceptable.Instrument should be recalibrate and precision study repeated.
• C) Precision study results are unacceptable.The sampling pipet should be replaced and precision study repeated.
• D) Precision study results are unacceptable.Review results for outliers if present eliminate from data and recalculate CV.

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