A 51-year-old woman's recent complaints of fatigue are thought to be attributable to iron-deficiency anemia. The patient's subsequent diagnostic testing includes quantification of her transferrin levels
This biochemical assessment would be performed by assessing which of the following?
A) The patient's urine
B) The patient's serum
C) The patient's cerebrospinal fluid
D) The patient's synovial fluid
Ans: B
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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.
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