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A rapid and simple R.I.A. method for serum unconjugated estriol in pregnancy had been studied for its usefulness as a routine obstetrical test to assess fetal well-being. Diluted serum samples or known amounts of standard estriol were applied with 125 I-estriol on pre-packed minicolumns of Sephadex G-25, followed by appropriately diluted antiserum. During incubation, the columns were counted in an Auto Well gamma-System to read the total counts (T). After a 90 minute incubation period, the columns were eluted with a buffer solution to remove the bound fraction, and the free estriol remaining in the columns was counted (F). Two quality control samples and sera from 74 pregnant women were analysed by this new method, and the results were compared to those obtained by the conventional radioimmunoassay method. The new column method is simple, specific and accurate. Results can be calculated within 4 hours after 30 sample sera are brought into the laboratory. Within and between assay coefficients, variations are 12.6 and 13.5%, respectively. This method correlates well with the results of the conventional method (r=0.7088, p less than 0.001), which requires almost 2 full days to process the same numbers of samples. Results of clinical cases as well as advantages of measuring free-circulating estriol in pregnancy are discussed.
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
November 1975,
Clinical chemistry,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
May 1977,
The Journal of laboratory and clinical medicine,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
November 1975,
Clinica chimica acta; international journal of clinical chemistry,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
April 1976,
Clinical chemistry,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
April 1976,
Steroids,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
January 1982,
Zhonghua fu chan ke za zhi,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
September 1975,
The Journal of laboratory and clinical medicine,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
August 1974,
Steroids,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
October 1982,
Clinical chemistry,
T Yamamoto, and
H Okano, and
T Okawa, and
N Sato, and
S Okinaga, and
K Arai
May 1980,
Zhonghua nei ke za zhi,
