Zusammenfassung: Drei kommerziell erhältliche Radioimmunoassays zur Bestimmung von Gallensäuren im Serum werden hinsichtlich ihrer Spezifität und Präzision bewertet. Der SLCG-Radioimmunoassay (Fa. Abbott) erfaßt das am engsten definierte Gallensäurespektrum (sulfatierte Glykolithocholsäure), der CG-Radioimmunoassay (Fa. Abbott) vornehmlich Cholsäurekonjugate und der CBA-Radioimmunoassay (Fa. Becton-Dickinson) alle konjugierten Gallensäuren, wobei Taurinmetaboliten überrepräsentiert sind. In Bezug auf die Kreuzreaktionen bestehen bedeutsame Unterschiede zu den Angaben des Herstellers für den CG-Radioimmunoassay, der zu 32% Taurocholsäure erfaßt, sowie für den CBA-Radioimmunoassay, der Taurochenodesoxycholsäure nur zu 118% ermittelt. Die Wiederfindungsrate definierter Cholänsäuren liegt bei physiologischen Albumin-Globulin-Konzentrationen zwischen 85 und 101 %. Gute Reprodüzierbarkeit wird für den CG-Radioimmunoassay im Bereich von 0,5 bis 10,0 / , für den CBARadioimmunoassay im Bereich von l ,0 bis 25,0 / und für den SLCG-Radioimiüurioassay im Bereich von 0,5 bis 3,0 / gefunden. Für die Inter-und IfttraassayJPräzision bestehen zwischen den drei Radioimmunoassays keine nenneswerten Unterschiede.
Comparison of commercially available radioimmunoassays for the determination ofbile acids in serumSummary: Three commercially available radioimmunoassays for the determination ofbile acids in serum were evaluated with respect tp specificity arid precision. The SLCG-radioimmunoassay (Abbott) measures only sulphated glycplithocholic acid, the CG-rädioimmunoassay (Abbott) measures chiefly cholic acid conjugates, and the CBA-radioimmunoassay (Becton-Dickinson) measures all conjugated bile acids, with an over-response tp taurine metabolites. With respect to cross reactions, the perfprmances of the CG-and the CBA-radioimmunoassays differed significantly from those stated by the inanufacturers, the former showing a 32% resppnse to taurocholic acid, the latter responding only 118% to taurochenodeoxycholic acid. At physiological concentrations Pf albumin + gjobulin, the recovery of defined chplanic aeids was 85-101%. Good reproducibility was showii by the CG-radioimmunpassay in the ränge 0.5-10.0 / , by the CBA-radioimmunoassay in the ränge 1.0-25.0 1/1, and by the SLCG^radioimmunoassay in the ränge 0.5-3.0 / . There were np important differences in the inter-and intra-assay precision of the three methods.
Conjugated bile acids and sulphated glycolithocholic acid in the serum ofhealthy probandsSummary: Using commercially available radioimmunoassays, bile acids were measured in the serum of 378 healthy probands. The following values were found: cpnjugated cholic acid 0.36 ± 0.38 / (95% percentile l .28 jumol/l) (CG-radiöimmuiioassay from Abbott); sum of the various conjugated cholanic acids 2.8 ± l .58 / (95% percentile 5.98 /1) (CBA*radioiminunoassay from Becton-Dickinson); sulphated glycolithocholic acid 0.57 ± 0.33 / (95% percentile 1.23 / ) (SLCG-radioimmunoassay from Abbott). The values showed a normal logarithmic distribution. No sex-specific differences were found between siinilar age groups of the 207 male and the 171 female probands. In 50 probands, serum cöncentrations were followed over a period of 3 hours after a standardized meal. Conjugated cholic acid showed a 5-fold postprahdial increase, compared with the cöncentrations measured in fasting probands. In 48% this maximum was reached within 60 minutes, in 32% within 2 hours, and in 20% within 3 hours. The cpncentrations of sulphated glycolithocholic acid were subject to only slight postprandial variations, which did not äppear until the secönd or third hour.Einführung säurenkinetik direkt beeinflussen. Die daraus folgenden -v.· r-j j vi--t -u* * · · AVeränderungen können in vielen Fällen anhand"der GalDie Forderung des Klinikers an dje Laboratonumsdia--\v _
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