title: Thyrotoxic erythrocytosis.
abstract: Erythrocytosis in a woman with hyperthyroidism prompted evaluation for other causes of an elevated hematocrit level. No underlying cause was identified, and the erythrocytosis resolved as the thyroid status returned to normal. The possibility of thyrotoxicosis should be considered in a patient with an elevated hematocrit value.
mesh_terms: D005260:Female; D006801:Humans; D006980:Hyperthyroidism / Q000150:complications* / Q000175:diagnosis; D008875:Middle Aged; D011086:Polycythemia / Q000209:etiology*; D013960:Thyroid Function Tests