Nephrol Dial Transplant (2001) 16: 1925-1929
© 2001 European Renal Association-European Dialysis and Transplant Association
Technical Note
Conversion between bromcresol green- and bromcresol purple-measured albumin in renal disease
1 Division of Nephrology, Dalhousie University, Halifax, NS, 2 Department of Clinical Chemistry, St Joseph's Hospital, Hamilton, ON, and 3 Division of Nephrology, McMaster University, Hamilton, ON, Canada
Abstract
Background. Albumin measured by a bromcresol purple dye-binding assay (AlbBCP) agrees more closely with the gold standard of immunonephelometry than does bromcresol green (AlbBCG) measurement. Both tests are in current clinical use. A method for converting between the two would be useful.
Methods. We measured albumin by bromcresol green and bromcresol purple in 535 patients, 155 of whom had renal disease. We randomly divided data from the patients with renal disease into two equal-sized sets, and used one set to derive, and the remaining set to validate, a regression equation relating the two values.
Results. The relationship AlbBCG=5.5+AlbBCP performed very well in both the renal patient validation set and in the data from 380 unselected in-patients and out-patients. Intraclass correlations for agreement between measured AlbBCG and predicted AlbBCG was 0.98 in both analyses.
Conclusions. The ability to convert between these measurements will be of use in clinical situations where the absolute value of the serum albumin is important, when data from laboratories using different methodologies must be combined, and in the application of the Modification of Diet in Renal Disease formula to estimate glomerular filtration rate in patients whose albumin has been measured by bromcresol purple.
Keywords: albumin; bromcresol green; bromcresol purple; conversion; immunonephelometry; measurements
Notes
Correspondence and offprint requests to: Dr Catherine M. Clase, Assistant Professor, Room 5088, Dickson Building, 5820 University Avenue, Halifax, Nova Scotia, B3H 1V8, Canada.
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