Question

An automated CK assay gives a reading that is above the limits of linearity. A dilution of the serum sample is made by adding 1 mL of serum to 9 mL of water. The instrument now reads 350 U/L. The correct report on the undiluted serum should be?

Answer 1

The correct report on the undiluted serum should be 3500 U/L.

Step-by-step explanation:

The correct report on the undiluted serum should be 3500 U/L.

When the serum sample was diluted by adding 1 mL of serum to 9 mL of water, the dilution factor was 1:10. This means that the concentration of the diluted sample is 1/10th of the original concentration.

Therefore, to find the concentration of the undiluted serum, we need to multiply the measured value of 350 U/L by the dilution factor, which is 10. The result is 3500 U/L.