Direct radioimmunoassay for the measurement of serum progesterone using 3H as a label.
J Immunoassay Immunochem
; 28(2): 137-46, 2007.
Article
en En
| MEDLINE
| ID: mdl-17424832
Direct radioimmunoassay (RIA), based on the principle of competitive inhibition for the measurement of serum progesterone using 3H as label, is described. Progesterone 3-O-carboxymethyloxime-bovine serum albumin (progesterone 3-O-CMO-BSA) was used as an immunogen and progesterone labeled at positions 1, 2, 6, and 7 with 3H was used as tracer. To 12 mm x 75 mm glass tubes, 100 microL of standard (250 pg to 50,000 pg/mL) and unknown samples were added, in duplicate, followed by 100 [LL of antibody and 600 microL of tracer (10,000 counts per minute [cpm]) in all of the tubes and incubated overnight at 4 degrees C. The bound and free fractions of labeled material were separated by adding 200 microL of charcoal followed by centrifugation. The bound radioactivity was measured in the supernatant by using a scintillation fluid containing 2,5-diphenyloxazole (PPO, primary scintillator) and p-Bis[2-(5-phenyloxazolyl)]-benzene (POPOP, secondary scintillator). In the present study, a high ionic strength, along with low and neutral pH of the buffer, is utilized to release bound steroid from proteins. The sensitivity of the assay is 732 pg/mL. The recovery ranged between 94.03% to 100.96%. The inter-assay and intra-assay coefficients of variation ranged from 3.89% to 7.59% and from 9.96% to 12.6%, respectively. The serum progesterone values, obtained by this method, were correlated with those obtained by enzyme linked immunosorbent assay; r = 0.96 (n=94).
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Progesterona
/
Radioinmunoensayo
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
J Immunoassay Immunochem
Asunto de la revista:
ALERGIA E IMUNOLOGIA
Año:
2007
Tipo del documento:
Article
País de afiliación:
India
Pais de publicación:
Reino Unido