The nurse is caring for an older patient experiencing new-onset atrial fibrillation. Which lab result is most concerning?
1. Hgb 13.8 g/dL
2. Hgb 11.0 g/dL
3. TSH 18 mU/mL
4. TSH 0.25 mU/mL
4. TSH 0.25 mU/mL
Explanation: 1. This is a normal hemoglobin level and would not help determine the cause of atrial fibrillation.
2. This is a normal hemoglobin level and would not help determine the cause of atrial fibrillation.
3. This is an elevated TSH level, which is a diagnostic indicator of hypothyroidism.
4. This is an abnormally low TSH level, which is a diagnostic indicator of hyperthyroidism that could be the cause for the patient's new-onset atrial fibrillation.
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