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How did she prepare the dilution? What do the units (U/L) imply in terms of CPK's enzymatic activity?

After analyzing a 1:55 dilution of serum, a lab technologist obtained a Total Creatine Phosphokinase (CPK) value of 243 U/L on a patient sample. Calculate the value reported out in the patient’s chart. How did she prepare the dilution? What do the units (U/L) imply in terms of CPK’s enzymatic activity?