Purpose: Kidney function assessment method is improving gradually. New biomarkers are studied and started using in clinical practice, such as beta 2 microglobulin. Beta 2 microglobulin is improving diagnostic and prognosis in CKD patients. We aimed to assess convenience usage of B2MG alone and B2MG based eGFR in Mongolian patients. Materials and method: We included 116 patients diagnosed with CKD and 55 donors whom with normal kidney function. We collected participant's blood sample by venipuncture in plain vacutainer. Creatinine, urea, cystatin C, B2MG were tested by Roche Cobas C311 equipment in serum. eGFR was calculated by online calculation from NKF. B2MG based eGFR was calculated by eGFR=133*B2M^-0.852 Result: Assessment of kidney biomarkers and eGFR was significantly correlated in both groups. Measured serum creatinine was 3.37 mg/dl in CKD patients and 0.87 mg/dl in donors. Serum urea was 97.6 mg/dl, 31.1 mg/dl, cystatin C 3.05 mg/L, 1.49mg/L and beta 2 microglobulin 10.65 mg/L, 2.43 mg/L respectively. Estimated GFR was 21.5-28.4 ml/min/1.73m2 in CKD patients and 47.7-103.9 ml/min/1.73m2 in donors. Assessing kidney function by biomarkers (r=0.720-0.918, p<0.05), and eGFR (r=0.495-0.996, p<0.05) were significantly correlated in both groups. Conclusion B2MG can be used in clinical practice in Mongolia. B2MG is optional with creatinine, urea, cystatin C for assessing and improving kidney function.