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PubMed1971

Statistical evaluation of diluents and automatic diluting and pipetting machines in influenza serology.

The use of three diluents (i.e., 0.01 m phosphate-buffered saline, PBS; PBS with 0.2% gelatin, PBS/GEL; and PBS with 0.4% bovine plasma albumin) and three methods (i.e., the standard tube macro-procedure, TUBE; the manual microtechnique, MANUAL; and the semiautomatic microtechnique, AUTO) were statistically compared for their reproducibility and sensitivity in determining hemagglutinin (HA) and hemagglutination-inhibition (HI) antibody titers. In the HA test, analyses of between-cell variances of the different methods showed the AUTO microtiter procedure to be more reproducible than the standard TUBE method. The MANUAL microtiter procedure was the least reproducible. In the HI test, the TUBE method was the most reproducible. No significant difference in the reproducibility of the diluents was observed in either the HA or HI test. When a comparison of the sensitivity of test methods and diluents was made for determining HA titers, the AUTO microtiter procedure and PBS/GEL diluent appeared to be the method and diluent of choice. Evaluation of another instrument, the autopipetter, which standardizes the volume of diluent to be added in the microtechnique, suggests that the reproducibility of the AUTO microtiter procedure might be further increased.

Analysis of Variance↗