Urine pH (reaction) test
Quick answer: This test measures whether urine is acidic or alkaline, reported as pH or as the urine's 'reaction'. It is part of routine urine analysis and helps doctors assess kidney stones, urine infections and some metabolic conditions.
- SampleUrine
- TakesA few minutes to give the sample
- Before the testNo special preparation is usually needed.
How the test is done
- 1You collect a midstream urine sample
- 2A dipstick with a pH pad is dipped in the urine
- 3The pad colour is matched against a chart
- 4Sometimes a pH meter is used for a more exact reading
What your results can mean
Reading your report
Urine pH changes with diet and time of day, so your doctor will read it with your other results.
If the result is outside the usual range
Acidic urine can be seen with high-protein diets, uncontrolled diabetes, starvation and some kinds of kidney stones. Alkaline urine can be seen with some urine infections, vegetarian diets, kidney tubule problems, or a sample left standing too long.
Who usually has this test
People with kidney stones, urine infections or kidney tubule problems; it is also part of every routine urine test.
Risks and aftercare
There are no risks, and no change to diet or fluids is needed after the sample.
Names and options
Also called: urine reaction, urine acidity
Options
- Reaction (pH), urine
- Reaction, urine
Listed by the hospital as
- REACTION PH, URINE
- REACTION, URINE
Questions about this test
Does food change urine pH?
Yes, diets rich in meat tend to make urine more acidic, while fruits and vegetables tend to make it more alkaline. A single result often reflects recent meals.
Why does urine pH matter for kidney stones?
Some stones form more easily in acidic urine and others in alkaline urine. Knowing the pH helps doctors understand the type of stone and how to prevent it.
Why must the urine sample be tested soon?
Urine left standing becomes more alkaline as bacteria grow. Testing a fresh sample gives a truer reading.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.