Official 2024 KDIGO 2D Staging Grid

Interactive KDIGO Stage & Urine Albumin (UACR) Heat Map

Looking at eGFR alone only tells half the story. Nephrologists use a two-dimensional grid combining your filtration speed (eGFR stages G1 to G5) with your filter tightness (spot urine Albumin-to-Creatinine Ratio A1 to A3). Enter your numbers below or click any box on the grid to see your exact KDIGO zone.

KDIGO G3a-A1 · Moderate Risk Zone Recommended Lab Check: 1x per year

Stage G3a with Normal Urine Albumin (A1)

Your eGFR is in the mild-to-moderate range (45 to 59), but your urine albumin is under 30 mg/g (A1). Having zero excess protein leakage is a very reassuring sign: it means the microscopic filter barrier is not actively leaking protein, which carries a much slower and more stable trajectory than G3a with high proteinuria.

Click Any Cell on the KDIGO 6x3 Matrix

Columns represent urine protein leakage (UACR). Rows represent blood filtration speed (eGFR).

eGFR Stage (Blood) \ UACR Stage (Urine)
A1
Normal to Mildly Increased
Under 30 mg/g
A2
Moderately Increased
30 to 300 mg/g
A3
Severely Increased
Over 300 mg/g
G1
Stage 1 (Normal or High)
eGFR ≥ 90
G2
Stage 2 (Mildly Decreased)
eGFR 60 - 89
G3a
Stage 3a (Mild to Moderate)
eGFR 45 - 59
G3b
Stage 3b (Moderate to Severe)
eGFR 30 - 44
G4
Stage 4 (Severely Decreased)
eGFR 15 - 29
G5
Stage 5 (Kidney Failure)
eGFR < 15

Why Urine Albumin (UACR) Changes Everything

Imagine your kidney filters like a coffee filter. eGFR measures how fast liquid flows through the filter, while UACR measures whether the paper has tiny tears letting coffee grounds (albumin protein) slip through.

When albumin leaks into the urine (A2 or A3), it irritates the downstream kidney tubules and speeds up scarring. Modern medications like ACE inhibitors, ARBs, SGLT2 inhibitors (Farxiga, Jardiance), and finerenone (Kerendia) work specifically by lowering pressure inside the filter and cutting UACR protein leakage by 30% to 50%.