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BackgroundThe bromocresol green (BCG) and bromocresol purple (BCP) methods are widely used for albumin measurements in routine testing, but the BCG method is known to react with globulin fractions and to have low specificity for albumin. We evaluated a calibration method using different concentrations of human serum albumin standards (two-point calibration BCG method) with the aim of reducing the effect of globulin fractions on the BCG method in patients with hypoalbuminemia.MethodIn the two-point calibration BCG method, two concentrations of standard solutions and their calibration values are set based on the difference in albumin concentrations measured by the BCG method (BCG-HSA method) and the modified BCP (modified BCP-HSA method) calibrated with human serum albumin standard solution (HSA). Albumin concentrations were measured in 136 patient serum samples (healthy group: 52, hypoalbuminemic group: 84) by the two-point calibrated BCG method and compared with those obtained using the modified BCP-HSA method.ResultsThe mean albumin concentrations obtained using the two-point calibrated BCG and modified BCP-HSA methods were 39.18 ± 3.42 g/L and 39.37 ± 3.14 g/L (healthy group) and 26.20 ± 6.23 g/L and 26.23 ± 5.67 g/L (hypoalbuminemia group), respectively. The results of the two-point calibration BCG method were in a close agreement over the entire concentration range tested compared to the modified BCP-HSA method.ConclusionsBased on these results, this calibration method reduces the influence of the globulin fraction on the BCG method. In the hypoalbuminemic group, the calibration method was shown to provide results consistent with the BCP method, which is highly specific for albumin.
Annals of Clinical Biochemistry: An International Journal of Biochemistry and Laboratory Medicine – SAGE
Published: Sep 1, 2023
Keywords: Serum albumin; bromocresol green; bromocresol purple; human serum albumin standard solution; two-point calibration; hypoalbuminemia
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