We measured beta-lipoprotein in 232 cord sera by rate nephelometry and compared the results with those obtained by electroimmunoassay. The mean (mean +/- two standard deviations) was 544 (293-1009) mg/L by rate nephelometry and 503 (265-955) mg/L by electroimmunoassay. The between-assay correlation coefficient was 0.891. Between-run coefficients of variation were 3.5-4.4% for nephelometry and 1...

IgM rheumatoid factors have been measured in 92 patients by both laser nephelometry and the traditional hospital procedure of a latex slide test followed by differential agglutination titre (DAT). Of the results 86% were in accordance by both methods, but seronegative patients with a high nephelometry score all showed, after reference to their clinical state and previous investigations, that th...

Concentrations of immunoglobulins were determined by laser nephelometry and, for comparison, by single radial immunodiffusion assay and a sandwich enzyme-linked immunosorbent assay (ELISA) in plasma samples of normal dogs. Correlation between methods was high, although the mean IgM concentrations determined by laser nephelometry were significantly higher than those determined by the single radi...

After quantitating immunoglobulins G, A, and M and complement C3c and C4 in serum by using a laser nephelometer coupled with a data processor, I compared these results with values obtained by an early-readout radial immunodiffusion method. Day-to-day precision was better for nephelometry than for radial immunodiffusion for all proteins analyzed. The average coefficient of variation was 6.0% for...

We performed interference studies for IgG, IgA, IgM, haptoglobin, and alpha1-antitrypsin assayed in serum, using either fixed-time nephelometry on the BN 100 from Behring or rate nephelometry on two analyzers from Beckman Instruments. For clear serum samples, results for IgG, IgA, IgM, and haptoglobin obtained with the three nephelometers showed good agreement. Values for alpha1-antitrypsin in ...