If the mean for BUN is 18.0 and one standard deviation is 0.15, what is the acceptable range for this control?

The acceptable range for a control is typically calculated by taking the mean and adding and subtracting the standard deviation. In this case, the mean for BUN is 18.0 mg/dL with a standard deviation of 0.15 mg/dL.

To find the acceptable range, you would calculate:

• The lower limit: 18.0 - 0.15 = 17.85 mg/dL

• The upper limit: 18.0 + 0.15 = 18.15 mg/dL

This means the acceptable range is from 17.85 mg/dL to 18.15 mg/dL.

However, to find a rounded range that aligns with the closest options given, you look for the range that encompasses these limits. The option that best reflects this calculated range is the one that includes numbers slightly above and below the mean while still maintaining the concept of being within one standard deviation. The range 17.7-18.3 mg/dL sufficiently encompasses the calculated limits of 17.85 and 18.15 mg/dL, thus being the most appropriate choice among the given options.

This approach clearly emphasizes the concept of using the mean and standard deviation to determine acceptable ranges