17. Hemoglobin <11g/dL or neutropenia of < 1000 per microlitre or a platelet count of less than 100,000 cells/mm3 Cockroft formula: CrCl (mL/min) = (140 - age) x Wt / 72 x serum creatinine (females x 0.85), age in years, Wt in kg, serum creatinine in mg/dL.