C1R levels in normal human sera determined by electroimmunoassay.
C1r levels in normal adults were determined by electroimmunoassay. The 95 per cent range was 71-133 per cent of a normal reference pool. C1r values were well correlated to the levels of C1q (r = 0.708) and of C1s (r = 0.768). The interplate variation of the method on double determinations was 3.4 (SD). C1r values in normal sera not appreciably affected by storage at room temperature or by repeated freezing and thawing. The C1r antigen in EDTA plasma was found to be labile.
D003172:Complement C1 / Q000032:analysis*; D003165:Complement System Proteins / Q000032:analysis*; D006801:Humans; D007118:Immunoassay; D012016:Reference Values; D013048:Specimen Handling
D003172:Complement C1; D003165:Complement System Proteins