Which term refers to the measurement of a large protein in the blood?

• A. Angiography
• B. Bilirubin
• C. Amniocentesis
• D. Albumin test

Answer: (D)

Measuring a large blood protein refers to the albumin test. Albumin is the most abundant protein in blood plasma, produced by the liver, and it helps maintain oncotic (fluid) pressure while also transporting many substances. When you order an albumin test, you’re quantifying how much albumin is present in the serum or plasma, which provides important information about liver function, nutritional status, kidney disease, and hydration. The other terms are not measures of a blood protein: angiography is an imaging study of the blood vessels, bilirubin is a pigment used to assess liver and bile flow, and amniocentesis is a procedure to collect amniotic fluid for fetal testing.