摘要:Our findings show that the value of IgG in serum of Alzheimer’s Disease patients is (17.2059 ± 2.6317) g/l and in controls i.e. (17.6720 ± 3.1457) g/l. Values of IgM in AD patients go down up to 62.5% in comparison to healthy subjects. A sudden change was observed in the levels of IgA of AD patients. It has been put on the value 137.9% high in comparison to healthy subjects. The levels of complement C3 have also value of lower side and go down up to 52.66% in AD patients. The value of levels of complement C4 shows no deflection from the control values. On the basis of regression and multiple correlation analysis, we found that the partial correlation coefficients rGA.M, which has value 0.44815 in AD patients and 0.45555 in controls, do not show any resemblance. The multiple partial correlation rAM.G has value 0.3082 in AD patients and 0.3912 in controls slightly better correlated in comparison to healthy controls. Multiple RA.MG has strongly correlation in comparison to controls. RM.AG is also strongly correlated. Regression coefficients and regression equations are basic foundations of correlation measurements and show a specific character of variation. A relation between all the three multiple correlations has been established in the present work and it is given by the following relation RA.MG > RM.AG > RG.AM.