The present recommendation is that GFR should be automatically
reported using the CKD-EPI or MDRD equation whenever a creatinine measurement is ordered [1]. Primary care physicians recommended
subspecialty referrals earlier when using eGFR versus creatinine for
assessment of kidney function, thus improving clinical outcomes for
patients with CKD [37,38]. It is therefore of the utmost importance
that available methods for measurement of creatinine be reliable,
allowing correct identification of kidney disease.