[Measurement of serum TSH concentration by radioimmunoassay (author's transl)].
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Biomedical subjects
Publications and source records attributed to T Mitsuma.
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Radioimmunoassayable TRH and TSH were measured in plasma samples taken at 5 min intervals for 4 hr (2100-0200 hr) from 4 normal male subjects. Three subjects showed a TSH surge at 2135 hr, 2455 hr and 0150 hr, respectively. The mean plasma TRH level of the 4 subjects was 10.3-11.7 pg/ml. Plasma TRH showed random fluctuation, which did not coincide with the nocturnal increase in plasma TSH.
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Plasma T3, T4 and TSH levels in developing germfree rats were high, low and normal as compared with those in conventional counterparts. The high T3/T4 ratio in germfree rat plasma was lowered by cholestyramine feeding.