Calculated using the abbreviated MDRD formula as below: eGFR (mL/min/1.73 m2) = 186 x serum creatinine (μmol/L)-1.154 x age (years)-0.203 x (0.742 if female) x (1.210 if African-American)
Calculated using the adjusted Cockcroft-Gault formula as below: eCrcr (mL/min/1.73 m2) = [ (140 - age) x mass (kilograms) x constant (1.23 if male, 1.04 if female) ] / serum creatinine (μmol/L)
Calculated using the Counahan-Barratt formula as below: eCrcr (mL/min/1.73 m2) = [ 0.43 x height (centimetres) ] / serum creatinine (μmol/L) x 0.0113 (correction factor for mg/dL)
Calculated using the Schwartz formula as below: eGFR (mL/min/1.73 m2) = [ 0.55 x height (centimetres) x K (constant) ] / serum creatinine (μmol/L) x 0.0113 (correction factor for mg/dL)
In first year of life, for pre-term babies K=0.33 and for full-term infants K=0.45. For infants and children between ages of 1 and 12 years, K=0.55. Adolescent boys, K=0.7.
Diploma in Nephrology 
CKD-Micro1
CKD Algorithm