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Serum free thyroxin (FT4) was determined in 40 patients with various nonthyroidal illnesses. We studied seven methods: (1) a free thyroxin index calculated from total T4 and triiodothyronine resin uptake; (2) a free T4 index determined by enzyme inhibitor assays (Abbott's "Tetrazyme" and "Thyrozyme"); (3) a free T4 index calculated from total T4 and thyroxin-binding globulin; (4) free T4 by equilibrium dialysis; (5) Amersham's free T4 RIA; (6) Clinical Assays' one-step free T4 RIA; and (7) Clinical Assays' two-step free T4 RIA. Approximately half of the free T4 results were in the euthyroid range and the other half in the hypothyroid range by methods 1, 2, 5, and 6. Results for free T4 by methods 3 and 7 were similar to those by equilibrium dialysis (method 4), the percentages of patients with results in the euthyroid range being 68%, 65%, and 76%, respectively.
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
May 1992,
Clinical chemistry,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
May 1984,
Clinical chemistry,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
January 1987,
Clinical chemistry,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
January 1989,
Clinical chemistry,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
August 1987,
Clinical chemistry,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
March 1984,
Clinical chemistry,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
May 1983,
Clinical chemistry,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
November 1986,
Nihon Naibunpi Gakkai zasshi,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
February 1986,
Taiwan yi xue hui za zhi. Journal of the Formosan Medical Association,
D W Chan, and
J M Waud, and
E Taylor, and
J Stem, and
H Drew, and
M Oropeza, and
M S Sucupira
January 1989,
Clinical chemistry,
