Author:
Rånby M,Bergsdorf N,Nilsson T,Mellbring G,Winblad B,Bucht G
Abstract
Abstract
A procedure for improving the specificity of enzyme-linked immunosorbent assays (ELISA) was devised, based on addition of antigen-specific or non-immune immunoglobulins to the citrated plasma sample and defining the difference in assay response between these two mixtures as the antigen-specific part of the response. When applied to measurement of tissue plasminogen activator (t-PA; EC 3.4.21.31) antigen in plasma, this procedure resulted in elimination of the overestimates obtained in a large proportion (10-20%) of patients' samples when assayed according to the conventional ELISA technique. Basal t-PA concentrations in plasma were found to be highly age-dependent, normal values being about 3 micrograms/L for adults near 30 years of age and about 10 micrograms/L for those over 60. Patients with gallbladder stone disease had increased mass concentrations of t-PA in plasma, even when corrected for the age effect; patients with multi-infarct dementia did not.
Publisher
Oxford University Press (OUP)
Subject
Biochemistry (medical),Clinical Biochemistry
Cited by
144 articles.
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