The nurse is reviewing the laboratory results for an older patient experiencing a new-onset of atrial fibrillation. On which laboratory value should the nurse focus as a potential cause for this diagnosis?
1. Hgb 13.8 g/dL
2. Hgb 11.0 g/dL
3. TSH 18 mU/mL
4. TSH 0.25 mU/mL
4
Rationale: This is a normal hemoglobin level and would not help determine the cause of atrial fibrillation.
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