Schwartz equation

Description
Formula for estimating clearance creatinine in children using:
 * serum creatinine – Crserum [mg/100ml];
 * height of the patient – H [cm];
 * proportional constants – for age and gender groups [3.46*10-8kg*s-1*m-2].

$$CCr_{Schwartz} = \frac{k * H}{Cr_{serum}}$$

Coefficients for other input units
Some laboratories, for example the one in FN Motol, give serum creatinine in μmol/l, it is then more practical to use adjusted constants for calculation.

Note
The formula becomes inaccurate at higher clearance values, so if the CCr rises above 75 mL/min per 1.73 m2, the results should not be considered accurate.

Indicative assessment of GFR in children
The value derived from the Schwartz formula indicates the maximum level of plasma creatinine in a child of a given body height:

Pkr (max. in μmol/l) = vcm * 0.54

''incm... child's height in centimeters''

The index already calculates with a lower limit of GFR of 90 ml/min/1.73 m2 = 1.5 ml/s/1.73 m2. The formula is indicative, in the case of repeated pathological findings, it requires control by classical methods.

Related Articles

 * Creatinine
 * Clearance

Source
http://www-users.med.cornell.edu/~spon/picu/calc/crclschw.htm