Table 1.

Different methods of expressing change in renal function and different baseline serum creatinine estimation methods reported in the literature

Methods of Expressing Acute Change in (Δ) Renal Function	Methods of Estimating Baseline Serum Creatinine, When Unknown
ΔSCr (6, 12)	MDRD eGFR = 75 ml/min per 1.73 m2 (9, 11)
ΔeGFR (9)	Lowest SCr during admission (for retrospective studies)
ΔSCr and Δurine output (5, 11)	Upper limit of normal SCr for age and gender (12)

SCr, serum creatinine; eGFR, estimated glomerular filtration rate; MDRD, Modified Diet in Renal Disease.