| Equation 1 | Serum creatinine GFR = 0.69 X [100/Pcr] |
| Equation 2 | Creatinine
clearance GFR = 0.81 X [Ccr] |
| Equation 3 | Average of
creatinine and urea clearance GFR = 1.11 X [(Ccr + Curea)/2] |
| Equation 4 | Creatinine
clearance, urea clearance and demographic variables GFR = 1.04 X [Ccr]=0.751 X [Curea]+0.226 X [1.109 if patient is black] |
| Equation 5 | Demographic,
serum and urine variables GFR= 198 X [Pcr]-0.858 X [age]-0.167 X [0.822 if patient is female] X [1.178 if patient is black] X [SUN]-0.293 X [UUN]+0.249 |
| Equation 6 | Demographic and
serum variables only GFR= 170 X [Pcr]-0.999 X [age]-0.176 X [0.762 if patient is female] X [1.180 if patient is black] X [SUN]-0.170 X [alb]+0.318 |
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