# Glomerular Filtration Rate Calculator

This tool will helps you to measure kidney function based on recommended equation.

 μmol/lmg/dl
 cminch

# Results

Estimated GFR value (mL/min/1.73 m2) = 4751.25 mL/min/1.73 m2

 μmol/lmg/dl
Black
Not Black
Male
Female

# Results

MDRD 4-Variable Equation = 18932.2 mL/min/1.73 m2

CKD-EPI Formula = 716 mL/min/1.73 m2

Mayo Quadratic Formula = 123 mL/min/1.73 m2

## Glomerular filtration rate (GFR)

It is a test used to check how well the kidneys are working. importantly, it estimates how much blood passes through the glomeruli each minute.

Estimating glomerular filtration rate (GFR) from serum creatinine in children is the Bedside Schwartz equation.

For Children :

This formula is for people aged 18 years or younger.

GFR (mL/min/1.73 m2) = (36.2 × Height in cm) / Creatinine in μmol/L< (SI Units)/p>

GFR (mL/min/1.73 m2) = (0.41 × Height in cm) / Creatinine in mg/dL (conventional units)

GFR (mL/min/1.73 m2) = 175 × (Scr/88.4)-1.154 × (Age)-0.203 × (0.742 if female) × (1.212 if African American) (SI units)

GFR (mL/min/1.73 m2) = 175 × (Scr)-1.154 × (Age)-0.203 × (0.742 if female) × (1.212 if African American) (conventional units)

GFR = 141 × min(Scr/k, 1)α × max(Scr/k, 1)-1.209 × 0.993Age × 1.018 [if female] × 1.159 [if African American] (SI Units)

Where,

Scr is serum creatinine in μmol/L,

α is 61.9 for females and 79.6 for males,

a is -0.329 for females and -0.411 for males,

min indicates the minimum of Scr/k or 1, and

max indicates the maximum of Scr/k or 1

GFR = 141 × min(Scr/k, 1)α × max(Scr/k, 1)-1.209 × 0.993Age × 1.018 [if female] × 1.159 [if African American] (conventional units)

Where,

Scr is serum creatinine in mg/dL,

α is 0.7 for females and 0.9 for males,

a is -0.329 for females and -0.411 for males,

min indicates the minimum of Scr/k or 1,

max indicates the maximum of Scr/k or 1

If SCr < 0.8 mg/dL, use 0.8 mg/dL for SCr

GFR = e(1.911 + 5.249/SCr - 2.114/SCr2 - 0.00686 × age - (0.205 if female))

Where,

e = 2.71828182845905

#### Convert μmol/l and mg/dl :

μmol/l is the most common measurement used in the UK with mg/dL predominantly used in the united states.

To convert μmol/l to mg/dl, multiply by 0.0113. To convert mg/dl to μmol/l, multiply by 88.4.

Chronic Kidney Disease Stages

StageGFR Value (mL/min/1.73 m2)
Normal90+ or above and no proteinuria
CKD190+ with evidence of kidney damage
CKD2 (Mild)60 to 89 with evidence of kidney damage
CKD3 (Moderate)30 to 59
CKD4 (Severe)15 to 29
CKD5 Kidney failureless than 15

Population Mean Estimated GFR

AgeMean Estimated GFR
(mL/min/1.73 m2)
20-29116
30-39107
40-4999
50-5993
60-6985
70+75

References

Schwartz GJ, et al. New equations to estimate GFR in children with CKD. J Am Soc Nephrol. 2009;20:629-637.

Schwartz GJ and Work DF. Measurement and estimation of GFR in children and adolescents. Clin J Am Soc Nephrol. 2009;4(11):1832-43.

Levey AS, Stevens LA, Schmid CH, Zhang YL, Castro AF, 3rd, Feldman HI, et al. A new equation to estimate glomerular filtration rate. Ann Intern Med. 2009;150(9):604-12.