Albuminuria Management
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Direct answer
Albuminuria of 30 mg per gram of creatinine or more, confirmed on two of three samples over three months, qualifies as kidney damage and independently predicts progression to kidney failure and cardiovascular death — which is why the urine albumin-to-creatinine ratio sits at the centre of every KDIGO-mandated review. A first-morning-spot ACR replaces the dipstick for screening, because dipsticks detect albumin only around the 300 mg/g range and miss moderately increased albuminuria entirely. Management is a ladder: ACE inhibitor or ARB at maximally tolerated dose, systolic pressure below 120 mmHg by standardised office measurement, an SGLT2 inhibitor for significant albuminuria, finerenone in diabetic kidney disease, and salt, smoking and NSAID counselling for everyone.
What you must remember
- Categories: A1 <30, A2 30–300, A3 >300 mg/g creatinine (3 and 30 mg/mmol); "microalbuminuria" is retired vocabulary — write A2, moderately increased albuminuria.
- Confirmation rule: two of three positive samples within three months, excluding urinary infection, fever, heavy exercise and menstruation before labelling.
- RAAS blockade: ACE inhibitor or ARB as monotherapy, uptitrated to maximum tolerated dose — never combined (ONTARGET and VA NEPHRON-D showed harm from dual blockade: hyperkalaemia and acute kidney injury).
- SGLT2 inhibitors: dapagliflozin (DAPA-CKD — 39 per cent relative reduction in the kidney composite) and empagliflozin (EMPA-KIDNEY); initiation permitted down to eGFR 20, continued until dialysis.
- Finerenone: non-steroidal mineralocorticoid antagonist for type 2 diabetes with CKD on top of RAS blockade (FIDELIO-DKD criteria: eGFR 25–60 with significant albuminuria); potassium is the limiter.
- Blood pressure: KDIGO targets systolic below 120 mmHg using standardised measurement — seated, average of readings, correct cuff — not a single casual clinic reading.
- Dipstick blindness: light chains and low-level albumin escape the strip; foamy urine with a negative dipstick demands a urine protein-to-creatinine ratio and serum free light chains.
- Benign mimic: orthostatic proteinuria of adolescents disappears on a first-morning sample — confirm before staging anyone young.
The escalation ladder in one patient
A 52-year-old man with type 2 diabetes has ACR 450 mg/g, eGFR 68 and BP 148/86 mmHg. Rung one: start ramipril and titrate over four weeks, with potassium and creatinine checked one to two weeks after each increase — a rise under 30 per cent is expected and acceptable. Rung two: the standardised office BP reads 132 systolic; reinforce salt restriction below 5 g/day before adding a second agent. Rung three: add dapagliflozin 10 mg, counselling that an initial eGFR dip of up to about 30 per cent from the afferent arteriolar effect is haemodynamic and acceptable, and that genital mycotic infections are the commonest nuisance. Rung four, three months later: ACR is 320, potassium 4.8 — add finerenone 10 mg daily, rechecking potassium at four weeks per label guidance. Rung five: teach sick-day rules — hold the SGLT2 inhibitor, RAS blocker and diuretic during vomiting or diarrhoea, an instruction that prevents more Indian emergency visits than any prescription. The audit target at twelve months is a halving of ACR, systolic pressure near 120, and a stable eGFR slope.
How the exam frames it
Albuminuria stems are sequencing and threshold questions. The classic distractors: combining ACE inhibitor with ARB (always wrong), refusing an SGLT2 inhibitor because eGFR is 24 (wrong — initiation is licensed to 20), and attributing a dipstick-negative nephrotic-range proteinuria to "early disease" when the answer is myeloma with light-chain escape. One recurring image-based question shows a foamy urine specimen beside a trace dipstick — the expected response is urine protein-to-creatinine ratio with electrophoresis, not repeat ACR. The A2 label itself is a language trap: options quoting "microalbuminuria 40 mg/day" against "moderately increased albuminuria, category A2" test vocabulary, not physiology.
Frequently asked questions
What ACR range defines category A2?
Moderately increased albuminuria: 30–300 mg/g (3–30 mg/mmol), confirmed on repeated samples.
Can an ACE inhibitor and ARB be combined for proteinuria?
No — dual blockade increased hyperkalaemia and acute kidney injury in ONTARGET and VA NEPHRON-D without renal benefit.
At what eGFR can SGLT2 inhibitors be initiated?
From eGFR 20 mL/min/1.73 m² with albuminuria, and continued until dialysis initiation; the initial eGFR dip is not a stopping rule.
Why can the dipstick be negative in myeloma?
Dipstick bromcresol chemistry detects albumin, not immunoglobulin free light chains — request urine protein-to-creatinine ratio and free light chain assay.
When is finerenone added?
In type 2 diabetes with CKD and albuminuria despite maximal RAS blockade, provided potassium permits, with potassium recheck at four weeks.