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Urine Albumin-to-Creatinine Ratio (UACR) Category

Place a urine albumin-to-creatinine ratio in KDIGO albuminuria category A1, A2 or A3.

Everyone & professionalsKidneyv1.0.1

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Methodology

KDIGO 2024 albuminuria categories

A1 < 30 mg/g; A2 30–300 mg/g; A3 > 300 mg/g (mg/g = mg/mmol × 8.84)

Albuminuria categories are used alongside GFR categories to classify CKD and its risk.

Who it is for
Adults; preferably an early-morning urine sample.
Version
1.0.1

How this calculator works

Where the formula comes from

  • KDIGO 2024 albuminuria categories: A1 <30 mg/g (<3 mg/mmol), normal to mildly increased; A2 30–300 mg/g (3–30 mg/mmol), moderately increased; A3 >300 mg/g (>30 mg/mmol), severely increased.[1]

The inputs

  • KDIGO advises confirming an ACR of 30 mg/g (3 mg/mmol) or more on a random sample with a subsequent first-morning midstream sample.[1]

Where accuracy falls (published evidence)

  • KDIGO lists haematuria, menstruation, exercise and infection among factors that can falsely raise ACR; women's lower creatinine excretion gives higher ACR values.[1]

Sources

  1. Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int. 2024;105(4S):S117–S314. doi:10.1016/j.kint.2023.10.018

Compiled from the published sources above. Every statement was agreed independently by three AI research tools (Claude, ChatGPT, DeepSeek) and its source verified in PubMed or Crossref by the Hakeemly editorial team. Not reviewed by a doctor unless stated. Agreed on

Worked example: how to calculate urine ACR category

Inputs

Albumin-to-creatinine ratio
20
Unit
mg/g

Result

ACR
20 mg/g
ACR
2.3 mg/mmol

A1 — normal to mildly increased (under 30 mg/g; under 3 mg/mmol)

An illustration with sample values, worked out with the same method the tool above uses.

Limitations

  • Blood in the urine, menstruation, exercise and infection can falsely raise ACR; KDIGO advises confirming 30 mg/g or more with a first-morning sample (KDIGO 2024).

References

  1. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int. 2024;105(4S):S117–S314. doi:10.1016/j.kint.2023.10.018

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