Low Serum 3,3′,5-Triiodothyronin (T3) and Reciprocally High Serum 3,3′,5′-Triiodothyronin (Reverse T3) Concentration in Spinal Cord Injury Patients

Thyroid function tests were performed on 115 spinal cord injury patients. Serum thyroxine, thyroid stimulating hormone, and T3 resin uptake were within normal range in all patients. Serum T3 levels tended to be low in paraplegic and quadriplegic patients, even though they were clinically euthyroid and other thyroid functions were normal. Serum reverse T3 levels were reciprocally higher in these patients.