Enter the K constant, height, and serum creatinine into the calculator to estimate the glomerular filtration rate (GFR) using the Schwartz equation.
Schwartz Equation Formula
The Schwartz equation is used to estimate the glomerular filtration rate (GFR) in children and is given by the formula:
eGFR = k * (height / creatinine)
Variables:
- eGFR is the estimated glomerular filtration rate (mL/min/1.73 m²)
- k is the proportionality constant that varies with age and sex (L/1.73 m²)
- height is the height of the child (cm)
- creatinine is the serum creatinine level (mg/dL)
To calculate the eGFR using the Schwartz equation, multiply the K constant by the ratio of the child’s height to their serum creatinine level.
What is the Schwartz Equation?
The Schwartz equation is a formula used to estimate the glomerular filtration rate (GFR) in children. The GFR is a measure of kidney function and indicates how well the kidneys are filtering waste from the blood. The Schwartz equation takes into account the child’s height and serum creatinine level, along with a proportionality constant (k) that varies with age and sex. This equation is widely used in pediatric nephrology to assess kidney health.
How to Calculate eGFR using the Schwartz Equation?
The following steps outline how to calculate the estimated GFR using the Schwartz Equation.
- First, determine the K constant (k) appropriate for the child’s age and sex.
- Next, measure the child’s height (cm).
- Obtain the child’s serum creatinine level (mg/dL).
- Use the Schwartz equation: eGFR = k * (height / creatinine).
- Finally, calculate the estimated GFR (eGFR) in mL/min/1.73 m².
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
K constant (k) = 0.55 (for prepubertal children)
Height (cm) = 130
Serum Creatinine (mg/dL) = 0.8
