What laboratory test is used to evaluate the level of protein in the blood?

The evaluation of protein levels in the blood is primarily assessed using serum albumin. Serum albumin is a key protein in the bloodstream, responsible for maintaining oncotic pressure and transporting various substances, including hormones, vitamins, and drugs. Its levels can provide essential information about an individual's nutritional status, liver function, and overall health.

A decrease in serum albumin levels can indicate several conditions, such as liver disease, kidney disease, malnutrition, or inflammatory processes. Therefore, measuring serum albumin is a standard practice in clinical settings to evaluate protein levels effectively.

Other tests mentioned, such as serum creatinine and blood urea nitrogen, primarily assess kidney function rather than directly measuring protein levels. The complete blood count primarily provides information on blood cells and their components, without specific insight into protein levels. Thus, serum albumin is the most relevant test when focusing on protein evaluation in the blood.