The degree of relaxation prolongation is proportional to the severity of hypothyroidism.
In general, the more hypothyroid a patient is, the longer the reflex relaxation time. In fact, most patients with untreated hypothyroidism have relaxation times greater than the normal 240 to 320 milliseconds. The diagnostic utility has been estimated at 62% to 100% in patients with symptomatic hypothyroidism.
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