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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Clinical utility of measuring free thyroxin and free triiodothyronine in serum of critically ill patients by ultrafiltration.

Free thyroxin (FT4) measurements by ultrafiltration were compared with results obtained by equilibrium dialysis and commercial RIA methods. In a group of critically ill patients, the mean +/- 2 SD FT4 value by ultrafiltration (26.5 +/- 21.4 ng/L) was higher than in the healthy reference population (19.3 +/- 9.8 ng/L, p less than 0.0001), and correlated well with equilibrium dialysis (23.8 +/- 20 ng/L, r = 0.87). By a two-step RIA method (Clinical Assays), the FT4 value was greater in the critically ill (14.7 +/- 9.6 ng/L) than in the reference population (12.8 +/- 5 ng/L, p less than 0.001) and was also correlated with ultrafiltration results (r = 0.71). FT4 values for the ill patients were lower than for the reference population in two one-step RIA methods (Clinical Assays: 8.6 +/- 7.1 ng/L; Corning Medical: 12.7 +/- 9.4 ng/L), neither of which gave results correlated with ultrafiltration (r = 0.16 and 0.22, respectively). The concentration of free triiodothyronine (FT3), also measured by ultrafiltration, was 4.5 +/- 2.2 ng/L in healthy subjects, 12.5 +/- 14.2 ng/L in hyperthyroidism, 1.7 +/- 2.0 ng/L in hypothyroidism, 2.2 +/- 1.9 ng/L in the critically ill subjects, and 3.8 +/- 0.9 ng/L in pregnancy. Thus, FT4 and FT3 measured by ultrafiltration accurately affects assessment of the thyroid status of the patient except in critical illnesses in which FT3 values are indistinguishable from those in hypothyroidism.[1]


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