Review Question - QID 106559

A 25-year-old woman presents to her primary care clinic for a general checkup. She states she's been a bit more fatigued lately during finals season but is otherwise well. Her mother and sister have hypothyroidism. She denies fatigue, weight gain, cold intolerance, constipation, heavy or irregular menses, or changes in the quality of her hair, skin, or nails. Physical exam is unremarkable. Laboratory studies are ordered as seen below.

Hemoglobin: 14 g/dL
Hematocrit: 40%
Leukocyte count: 5,500/mm^3 with normal differential
Platelet count: 188,000/mm^3

Serum:
Na+: 139 mEq/L
Cl-: 102 mEq/L
K+: 4.4 mEq/L
HCO3-: 24 mEq/L
BUN: 20 mg/dL
Glucose: 99 mg/dL
Creatinine: 0.8 mg/dL
Ca2+: 10.2 mg/dL
Antithyroid peroxidase Ab: Positive
AST: 12 U/L
ALT: 10 U/L

Which of the following laboratory values is most likely in this patient?