A nephelometric assay (Beckman ICS) for the measurement of plasma fibronectin using commercially available reagents (Boehringer) is described. The assay is simple, rapid and cheap and has a high degree of specificity. The within-run variation was between 4·3 and 7·8%. Only 30 μL of antiserum is used for one measurement, instead of 100 μL used with the turbidimetric method.
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