A tumor of plasmacytoid cells that is diagnosed as Waldenström macroglobulinemia produces a paraprotein that is an:

1,25(OH)2D, also known as 1,25-dihydroxy vitamin D, is the best blood test for determining adequacy of Vitamin D stores in the body.

The set of results that most accurately reflects severe renal disease is:

An individual has several laboratory tests ordered and is having blood collected. After applying the tourniquet, the phlebotomist has to answer the phone and write down a message, leaving the tourniquet in place for approximately 3 minutes. How will this affect this individual’s serum composition of total protein and potassium?

You arrive at the clinical chemistry laboratory one morning and discover that personnel from the third shift left you the QC sheet from the thyroid-stimulating hormone (TSH) run. The technician has circled the level I TSH control values, and you realize that all six of the level I control values are +3 s from the mean. No results have been released. Now it’s your decision regarding what to do next. What kind of error is most likely occurring?

Which one of the following statements concerning lipase is incorrect?

When you receive a urine sample for legal testing of drugs of abuse, you must maintain a(n) _____ to identify all individuals involved in specimen collection, transfer, and testing.

In the majority of clinical chemistry immunoassays, the analyte of interest in a patient’s serum is typically the:

Hyperproteinemia is caused by:

Creatininase reactions for creatinine assessment: