Clinical Chemistry
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Clinical Chemistry 35: 211-214, 1989;
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Clinical Chemistry, Vol 35, 211-214, Copyright © 1989 by American Association for Clinical Chemistry

Optimized microturbidimetric assay for fibrinogen

M Macart, A Koffi, G Henocque, JF Mathieu and JC Guilbaud
Laboratoire du Centre Hospitalier de Laon, France.

In this assay we measure the turbidity produced by precipitation of plasma fibrinogen with a reagent composed of ammonium sulfate, EDTA, and guanidine hydrochloride. The two-step reagent addition, and use of fixed reaction times, eliminates interference from bilirubin, hemoglobin, and chylomicrons. We checked 135 monoclonal proteins for interference, finding the probability of encountering major interference in samples from adults to be very low, P = 0.0002. The method is calibrated with purified fibrinogen and the response is linear over the range 0-10 g/L. Within-run precision (CV) is less than 2% from 1 to 10 g/L. Correlations with the immunoturbidimetric (r = 0.99), chronometric (r = 0.99), and clotting (r = 0.97) methods were extremely high.


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Copyright © 1989 by the American Association for Clinical Chemistry.