- Satisfactory renal function. Serum creatinine <1.5 x ULN (150 mmol/l). If creatinine 1.0 - 1.5 x ULN, creatinine clearance will be calculated according to CKD-EPI formula and patients with creatinine clearance >60 mL/min are accepted in the study. https://www.qxmd.com/calculate-online/nephrology/ckd-epi-egfr