Table 4.

Calculated uncertainties for serum creatinine, CKD-EPI eGFR and the RCV of that eGFR for a male with a creatinine of 120 μmol/L

	At median QAP performance CV %	Worst QAP performance CV %
Uncertainty of measurement of serum creatinine (%) using coverage factor of 2	6	9.4
Uncertainty of measurement of eGFR calculated as UM creatinine × 1.209 (%)	5.2	11.4
Uncertainty at eGFR of 60 which equates to a creatinine of 120 μmol/L	57–63	53–67