**16.3 Hypothyroidism**

Among 19,519,000 hospitalized patients with a diagnosis of hypothyroidism from 1979 to 2005, 119,000 (0.61%) had PE (relative risk 5 1.64).205 DVT was diagnosed in 1.36% of hypothyroid patients (relative risk 5 1.62).205 The relative risk for PE in patients with hypothyroidism was highest in patients younger than 40 years (relative risk 5 3.99) and the relative risk for DVT was also highest in patients younger than 40 years (relative risk 5 2.25). Hyperthyroidism was not associated with an increased risk for VTE (relative risk 5 0.98).
