Table 3.

Correlation between serum B2 microglobulin and different laboratory findings, disease activity and damage score

B2 microglobulin level	Spearman's rho	p value
WBCs (109/L)	− 0.119	0.237
Neutrophils (109/L)	− 0.046	0.652
Lymphocytes (109/L)	− 0.150	0.136
HGB (gram/dl)	− 0.446	< 0.001*
Platelet (109/L)	− 0.101	0.317
ESR (mm/hr)	0.499	< 0.001*
CRP (mg/L)	0.479	< 0.001*
24 h urinary protein (mg/24 h)	0.733	< 0.001*
Bun (mg/dl)	0.351	< 0.001*
Serum creatinine (mg/dl)	0.373	< 0.001*
G.F.R (ml/min)	− 0.32	0.001*
C3 (mg/dl)	− 0.409	< 0.001*
C4 (mg/dl)	− 0.445	< 0.001*
SLEDAI 2 K SCORE	0.725	< 0.001*
Total score (damage score)	0.603	< 0.001*
Activity index	− 0.029	0.880
Chronicity index	0.174	0.359

P value > 0.05: non-significant (NS); P value < 0.05: significant (S); P value < 0.01: highly significant (HS)

WBC white blood cell, ESR erythrocyte sedimentation rate, CRP C-reactive protein, Bun blood urea nitrogen, GFR glomerular filtration rate, C3 complement 3, C4 complement 4, SLEADI score systemic lupus erythematosus disease activity

*Significant test