Serum 3'-monoiodothyronine levels in normal subjects and in patients with thyroid and non-thyroid disease.
Serum 3'monoiodothyronine (3'-T1) levels were estimated by means of a specific radioimmunoassay (RIA) preceded by an ethanol extraction. The recovery of 3'T1 was in mean (+/-SEM) 110 +/- 9%, and the lower detection limit was 23 pmol/l. Serum levels of 3'T1 in 34 euthyroid healthy subjects were (median (range)) 55 pmol/l (less than 23 - 168 pmol/l), in 13 hyperthyroid patients 133 pmol/l (70 - 265 pmol/l) (P less than 0.01) and in 13 hypothyroid patients less than 23 pmol/l (less than 23 - 68 pmol/l) (P less than 0.01). In 11 patients with chronic renal failure serum 3'-T1 levels were highly increased 285 pmol/l (115 - 1538 pmol/l) (P less than 0.01) and correlated inversely to creatinine clearance (R = -0.68, P less than 0.05). In patients with liver cirrhosis serum 3'-T1 levels were unaffected, whereas in 19 patients with endogenous depression studied before and after recovery from the depression serum levels decreased from 70 pmol/l (less than 23 - 248 pmol/l) to 30 pmol/l (less than 23 - 95 pmol/l) (P less than 0.01). Administration of propranolol 40 mg b.i.d. for 2 weeks did not affect serum 3'-T1 levels. The study shows that 3'-T1 is present in serum from euthyroid man and varies with thyroid function. Further, it is suggested that 3'-T1 in contrast to other iodothyronines primarily is eliminated by the kidneys.[1]References
- Serum 3'-monoiodothyronine levels in normal subjects and in patients with thyroid and non-thyroid disease. Kirkegaard, C., Faber, J., Cohn, D., Kølendorf, K., Thomsen, H.F., Lumholtz, I.B., Siersbaek-Nielsen, K., Friis, T. Acta Endocrinol. (1981) [Pubmed]
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