Abstract
Nephrotic syndrome (NS) is characterized by massive urinary protein leakage and associated hypoproteinemia due to increased protein permeability caused by impaired renal glomerular connections. Although there have been several sporadic reports regarding the relationship between NS and thyroid dysfunction, a consensus has yet to be reached. The mechanism of hypothyroidism in NS is attributed to the loss of protein-bound thyroid hormones, such as thyroxine-binding globulin, transthyretin, and albumin, into the urine. Herein, we report four adults with hypothyroidism that developed or worsened due to the onset of NS. The patients' underlying thyroid status was post-total thyroidectomy with supplemental levothyroxine (L-T4) in two patients, hypothyroidism with supplemental L-T4 due to Hashimoto's disease in one patient, and Hashimoto's disease with normal thyroid function in one patient. Our results suggest that the presence of a reduced thyroid reserve may predispose patients to hypothyroidism in NS. We conclude that NS may cause or exacerbate hypothyroidism. In such cases, an NS assessment, including a urine test, is required.
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