What does it measure?
This calculated ratio compares urine albumin with creatinine from the same sample. Creatinine helps account for urine dilution. “Microalbumin” refers to a small amount of ordinary albumin, not a smaller type of protein. The test is especially useful when assessing kidney risk in diabetes or high blood pressure.
Before reading the calculation
- Inputs
- A urine sample measures both albumin and creatinine to calculate the ratio.
- Before collection
- Ask about exercise instructions and mention fever, urinary symptoms, or menstruation.
What can the result mean?
A raised ratio can be an early kidney warning sign, even when blood filtration tests remain reassuring. A low ratio means little albumin was detected, but does not exclude every kidney problem. One raised reading does not establish chronic kidney disease. [1]
A urine sample measures both albumin and creatinine to calculate the ratio.
- Before collection
- Ask about exercise instructions and mention fever, urinary symptoms, or menstruation.
When is it useful, and how is it read?
Read the ratio alongside eGFR and blood pressure, especially in diabetes or known kidney disease. Repeated elevation carries different weight from one result during infection, fever, or recent strenuous exercise. [1]
Reading the results together
| Marker | What it adds |
|---|---|
| Microalbuminuria, Random Urine (Alb-Creat Ratio) | Assesses albumin reaching urine relative to urine creatinine. |
| Creatinine in Urine | Helps account for how concentrated the urine sample is. |
| eGFR | Estimates how well the kidneys filter blood. |
A reassuring filtration estimate does not make a persistent albumin leak irrelevant. Both findings matter. [1] [2]
What can affect it?
Hard exercise, fever, urinary infection, menstruation, and temporary changes in blood pressure or glucose can raise the result. A first-morning sample may help confirm an unexpected finding. [1]
“Microalbumin” is ordinary albumin in a small amount
The name describes a small albumin loss, not a tiny version of the protein. Comparing it with urine creatinine helps account for how dilute the sample is. [1]
Questions you might have
Does “microalbumin” mean a different small protein?
No. It refers to detecting a small amount of the same albumin protein in urine. [1]
Why repeat an unexpectedly high ratio?
Exercise, fever, or inflammation can raise albumin temporarily. Repeat testing checks whether the increase persists. [1]
What comes next?
Review it with eGFR and blood pressure. Your clinician may repeat testing to confirm persistence before deciding on a kidney-protection plan. Avoid comparing values with different units without checking the conversion. [1]
Has the albumin increase persisted on repeat samples, and how does it fit with my eGFR and blood pressure?
The reference interval and units on your report are part of understanding your result. Understand units, reference intervals, and treatment targets.
Sources & references
Medical references & original research
Books we consulted
References that informed our explanations of the test and its context.
- Pagana KD, Pagana TJ, Pagana TN. Mosby’s Diagnostic and Laboratory Test Reference. 14th ed. Elsevier; 2019.
Practical-section sources accessed: .
For general health education. Interpreting your result and deciding on tests or treatment requires your health context and a qualified clinician.
