Which of these tests is used to analyze specific proteins in blood?

Serum protein electrophoresis is a laboratory method specifically designed to separate and analyze the different proteins present in a sample of serum, which is the liquid portion of blood that remains after clotting. This test measures the levels of specific proteins, including albumin and globulins, and can help in diagnosing various conditions, such as liver and kidney diseases, inflammatory disorders, and certain types of cancer.

By applying an electric field to a serum sample, proteins migrate based on their size and charge, allowing for their identification and quantification. The resulting patterns can indicate abnormalities in protein production or distribution, providing crucial information for physicians in managing patient care.

Other tests provided in the choices serve different purposes: a complete blood count evaluates overall health and detects a variety of disorders, a glucose tolerance test assesses how well the body processes sugar, and urinalysis examines urine for signs of disease or infection. None of these tests focus specifically on the detailed analysis of proteins in blood, making serum protein electrophoresis the most appropriate answer in this context.