A nucleoprotein complement-fixation test to assist in the diagnosis of systemic lupus erythematosus is evaluated. There were 25 positive reactions in 600 serum specimens tested.

NORMAL guinea pig serum is the most common source of complement for the complement-fixation test, and may be used fresh or, more commonly, preserved either by freeze-drying or by Richardson's ...

3. Data are presented regarding optimal conditions of preparation of antigens and of the hemagglutination test.4. The hemagglutination test is not more sensitive for the detection of antigenic ...

The IgM fractions obtained after rate zonal-density gradient ultracentrifugation of 37 serum samples from 12 patients were also studied in a complement fixation test (CF-DG). Specific IgM antibody to ...