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Table 1 Different stages of renal function

From: HPLC estimation of iothalamate to measure glomerular filtration rate in humans

Stages GFR (mL/min) Kidney function
Stage 1 ≥90 Normal
Stage 2 60–89 Slight decrease
Stage 3 30–44 Mild decrease
Stage 4 15–29 Severe decrease
Stage 5 ≤15 Renal failure