A semiquantitative measurement of anti-nuclear antibody using immuno-microfluorimetry.

1. Using microfluorimetry, the strength of fluorescence was measured on fluoresceinated anti-nuclear antibody of SLE sera. The indirect "Sandwich" method was applied using human peripheral lymphocytes as substrates tissue. 2. The results of using three FITC-labelled anti-human IgG conjugates of different types were compared with each other. 3. More specific and more consistent results were obtained with conjugates with a lower F/P ratio and lower antibody and protein concentration that those in the case of conjugates with a higher F/P molar ratio and higher antibody and protein concentration. 4. The immuno-microfluorimetric technique is very useful for the objective determination of the results of fluorescence microscopy and for the comparison of conjugates of different qualities.