* This calculator is not valid for people aged less than 18 years.
** Currently some pathology results may use an alternate formula, which will result in a slightly different result.
Refer to our webpage in this section - Detecting CKD - for more information on this reading.
The new CKD-EPI formula provides a more precise calculation for the measurement of eGFR, the measurement of kidney function. eGFR is now calculated using the CKD-EPI formula as it improves risk stratification. This will make limited or no difference to your practice.
Updated 2 October 2012