Urine Protein and Albumin Ratios
A urine ratio in the units KDIGO uses, placed on the risk grid · v1.1- Enter the urine albumin or protein together with the urine creatinine from the same sample, in whatever units your laboratory reports them.
- Use a first-morning sample where you can: exercise and time spent upright both raise albumin excretion through the day.
- You get the conversion to the KDIGO standard units of mg/g and mg/mmol, and the albuminuria category.
- Where you do not yet know which of the two pictures you are in, run both ratios.
- The staging of chronic kidney disease, which needs the eGFR as well. That grid sits in the AKI & CKD Staging Pathway.
- The cause of the proteinuria.
- The separation of albumin from the globulins, light chains and tubular proteins that a protein ratio also counts. That is the whole reason the two ratios are reported apart.
- A diagnosis from a single sample. Fever, heavy exertion, a urinary tract infection, menstrual contamination and decompensated heart failure all lift a ratio for a few days, and KDIGO defines the abnormality by its persistence beyond three months.
- Any correction for muscle mass. It sits in the creatinine denominator, so a very muscular patient reads low and a wasted one reads high for the same true excretion.
1. Which Ratio Do You Need
2. Laboratory Values
The Concentration Caution in Indian Diagnostics:
Many local laboratories report a raw spot urine microalbumin, 25 mg/L say, and flag it as abnormal against a generic cut-off, usually > 20 mg/L. That flag says as much about the patient's fluid intake as about their kidneys. A concentrated first-morning sample carries more of everything in it, and a dilute afternoon sample carries less of everything, the albumin included. Divide the raw albumin by the urine creatinine from the same sample and the dilution cancels out. It is that ratio, and not the raw value, that the KDIGO categories were built on.
Many local laboratories report a raw spot urine microalbumin, 25 mg/L say, and flag it as abnormal against a generic cut-off, usually > 20 mg/L. That flag says as much about the patient's fluid intake as about their kidneys. A concentrated first-morning sample carries more of everything in it, and a dilute afternoon sample carries less of everything, the albumin included. Divide the raw albumin by the urine creatinine from the same sample and the dilution cancels out. It is that ratio, and not the raw value, that the KDIGO categories were built on.
1. KDIGO 2024 Albuminuria Categories (UACR)
| Category | UACR (mg/g) | Clinical Interpretation |
|---|---|---|
| A1 | < 30 | Normal to mildly increased. Minimal risk if eGFR is preserved. |
| A2 | 30 – 300 | Moderately increased (formerly microalbuminuria). Indicates early endothelial dysfunction or early diabetic kidney disease. |
| A3 | > 300 | Severely increased (formerly macroalbuminuria). High risk of progression to kidney failure and of cardiovascular events. |
2. Total Proteinuria Categories (UPCR)
UACR catches the early diabetic and hypertensive change first, because albumin is the protein that leaks earliest through a damaged glomerular barrier. UPCR counts everything: albumin, globulins, light chains, tubular proteins. That is why a suspected paraproteinaemia or tubulointerstitial disease needs the protein ratio, where an albumin-specific assay would look reassuringly normal. When you do not yet know which of the two pictures you are in, run both.
- Normal: < 150 mg/g (< 0.15 mg/mg)
- Mild / Sub-nephrotic: 150 to 500 mg/g
- Moderate / Overt: 500 to 3500 mg/g
- Nephrotic Range: > 3500 mg/g (> 3.5 mg/mg). Refer to nephrology promptly; a biopsy is likely.
3. Illness Scripts: Three Common Aetiologies
| Diagnosis | Typical Ratio Profile | Key Clinical Features |
|---|---|---|
| Diabetic Kidney Disease (DKD) | Predominant UACR elevation initially (A2 → A3). | Bland urinary sediment. Retinopathy often co-exists. Gradual progression. |
| Glomerulonephritis (e.g., IgA) | High UPCR. Often nephrotic range. | Active sediment (dysmorphic RBCs, RBC casts). Acute onset or post-infectious. |
| Hypertensive Nephrosclerosis | Mild UACR/UPCR elevation (< 1000 mg/g). | Long-standing HTN, LVH on ECG, small/contracted kidneys on ultrasound. |
Therapeutic Implications: A2 or A3 albuminuria is itself an indication to start nephroprotection, whatever the glycaemic control is doing. The reason is that these agents work on the pressure inside the glomerulus rather than on the glucose, and the albuminuria is the marker of that pressure injury. First-line agents are ACE inhibitors or ARBs, titrated to the maximum tolerated dose, and SGLT2 inhibitors such as dapagliflozin and empagliflozin. Finerenone, a non-steroidal MRA, is for residual albuminuria in type 2 diabetes.
Abbreviations: ACE (Angiotensin-Converting Enzyme) · ACEi (Angiotensin-Converting Enzyme Inhibitor) · ARB (Angiotensin Receptor Blocker) · BP (Blood Pressure) · DKD (Diabetic Kidney Disease) · DM (Diabetes Mellitus) · ECG (Electrocardiogram) · eGFR (Estimated Glomerular Filtration Rate) · HTN (Hypertension) · IgA (Immunoglobulin A) · KDIGO (Kidney Disease: Improving Global Outcomes) · LVH (Left Ventricular Hypertrophy) · MRA (Mineralocorticoid Receptor Antagonist) · RAAS (Renin-Angiotensin-Aldosterone System) · RBC (Red Blood Cell) · SBAR (Situation, Background, Assessment, Recommendation) · SGLT2 (Sodium-Glucose Cotransporter-2) · SGLT2i (Sodium-Glucose Cotransporter-2 Inhibitor) · UACR (Urine Albumin-to-Creatinine Ratio) · UPCR (Urine Protein-to-Creatinine Ratio) · UTI (Urinary Tract Infection)
References
- Kidney Disease: Improving Global Outcomes (KDIGO) 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int. 2024;105(4S):S117-S314.
- Association of Physicians of India (API). API Guidelines on Management of Chronic Kidney Disease. In: API Medicine Update. 2023.
- Levey AS, Becker C, Inker LA. Glomerular filtration rate and albuminuria for detection and staging of acute and chronic kidney disease in adults. JAMA. 2015;313(8):837-846.
- Stevens PE, Ahmed SB, Carrero JJ, et al. Executive summary of the KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease: known knowns and known unknowns. Kidney Int. 2024;105(4):684-701.
- Inker LA, Eneanya ND, Coresh J, et al. New creatinine- and cystatin C-based equations to estimate GFR without race. N Engl J Med. 2021;385(19):1737-1749.
- Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2012 clinical practice guideline for the evaluation and management of chronic kidney disease. Kidney Int Suppl. 2013;3(1):1-150.
- Indian CKD Guideline Workgroup, Indian Society of Nephrology. Indian Chronic Kidney Disease Guidelines. Indian Society of Nephrology; December 2013.
- Hull RP, Goldsmith DJA. Nephrotic syndrome in adults. BMJ. 2008;336(7654):1185-1189.
How to Cite This Tool
DOIhttps://doi.org/10.5281/zenodo.22401657
AMA Style:Umakanth S. Urine Protein and Albumin Ratios. Version 1.1. MEDiscuss Clinical Decision Support System. Published 2026. Accessed . https://mediscuss.org/cdss/uacr-upcr-calculator. doi:10.5281/zenodo.22401657
Vancouver Style:Umakanth S. Urine Protein and Albumin Ratios [Internet]. Version 1.1. MEDiscuss.org; 2026 [cited ]. Available from: https://mediscuss.org/cdss/uacr-upcr-calculator. doi:10.5281/zenodo.22401657
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