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Clinical Chemistry, Vol 35, 86-89, Copyright © 1989 by American Association for Clinical Chemistry
KB Whitaker, TM Cox and DW Moss
Department of Chemical Pathology, Royal Postgraduate Medical School, Hammersmith Hospital, London, U.K.
We describe an immunoassay for human band-5 acid phosphatase in which antibodies to porcine uteroferrin, immobilized on Sepharose particles, are used. Band-5 acid phosphatase is the tartrate-resistant isoenzyme normally expressed in tissue macrophages such as osteoclasts and alveolar macrophages. The immunoassay is similar in reproducibility and sensitivity to assays based on inhibition by d-tartrate. However, compared with the latter, the greater specificity of the immunoassay makes it markedly less susceptible to errors arising from the presence of non-band-5 acid phosphatases, e.g., from prostate.
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