A 51-year-old womans recent complaints of fatigue are thought to be attributable to iron-deficiency anemia. The patients subsequent diagnostic testing includes quantification of her transferrin levels. This biochemical assessment would be performed by assessing which of the following?

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Biochemical assessments are made from studies of serum (albumin, transferrin, retinol-binding protein, electrolytes, hemoglobin, vitamin A, carotene, vitamin C, and total lymphocyte count) and studies of urine (creatinine, thiamine, riboflavin, niacin, and iodine). Transferrin is found in serum, not urine, CSF, or synovial fluid.

A 51-Year-Old Womans Recent Complaints of Fatigue Are Thought to Be