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Urine pH Test

Published: July 31, 2026Updated: August 16, 2026

A urine pH test measures how acidic or alkaline your urine is using an automated test strip, helping your doctor evaluate kidney function, hydration, and possible urinary tract problems.

Quick summary

{"Urine pH indicates how acidic or alkaline your urine is","Normal urine pH ranges from 4.5 to 8","Diet, medications, and certain health conditions can affect pH levels","This test helps diagnose kidney stones, urinary tract infections, and metabolic disorders","The test is performed using an automated chemical test strip"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
50560-2
Short code
Urine pH / UPH / URPH
Synonyms
pH Ur Strip.auto
Category
chemistry
Sample
serum
Container
Clean-catch urine container / Sterile urine cup
Units
not specified
Ref low
4.5
Ref high
8
Critical range
6 not specified – 8.5 not specified
Fasting
false
Population
adult
Sex
all
Age range
≥ 0 years
Method
test-strip-automated
CPT
81001 (Urinalysis, non-automated) or 81003 (Urinalysis, automated)
SNOMED
27171001 (Urine pH measurement)
Specimen volume
10-20 mL preferred, minimum 2 mL
Stability
Room temperature: 2 hours. Refrigerated (2-8°C): 24 hours. Do not freeze. Test within 2 hours of collection for optimal results.
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
1–4 hours
Order
routine

What is this test?

A urine pH test measures the hydrogen ion concentration in your urine, indicating how acidic or alkaline (basic) your urine is. The automated test strip method uses chemical reagents that change color based on the pH level of the urine sample. This color change is then read by an automated analyzer to provide a precise pH reading.

How is the test performed?

A clean catch urine sample is collected in a sterile container. A test strip coated with pH-sensitive chemicals is dipped into the sample. The strip changes color, and the automated analyzer measures this color change to determine the exact pH value. This process is quick, automated, and provides accurate results.

Why might I need this test?

Your healthcare provider may order a urine pH test as part of a routine urinalysis or to help diagnose specific conditions. It is often used to evaluate kidney function, detect urinary tract infections, monitor certain treatments, or investigate symptoms like frequent urination, pain, or blood in urine.

Reference range

4.5-8.0not specified

Specimen: serum

No fasting or special preparation required. Midstream clean-catch specimen preferred; analyze promptly.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Urine pH is clinically significant because it can indicate various health conditions. Acidic urine (pH below 6.0) may suggest metabolic acidosis, diabetic ketoacidosis, diarrhea, or a diet high in meat. Alkaline urine (pH above 7.0) may indicate urinary tract infections, kidney stones (particularly struvite stones), or metabolic alkalosis. Certain medications, diets high in fruits and vegetables, and renal tubular acidosis can also affect pH levels. Healthcare providers use urine pH results along with other tests to diagnose and monitor conditions affecting acid-base balance, kidney function, and urinary tract health.

Frequently asked questions

Is fasting required before the urine pH test?
No fasting is typically required for a urine pH test. However, you should inform your doctor about any medications, supplements, or dietary changes, as these can affect your urine pH results.
What is the normal range for urine pH?
The normal urine pH range is typically between 4.5 and 8, with an average of about 6.0 (slightly acidic). Values outside this range may indicate underlying health conditions that require further investigation.
Can my diet affect urine pH?
Yes, diet significantly affects urine pH. Diets high in meat and dairy products tend to produce more acidic urine, while diets rich in fruits and vegetables can produce more alkaline urine. Staying hydrated also helps maintain normal pH levels.
Does the time of day affect urine pH?
Urine pH can vary throughout the day based on meals, activity levels, and hydration status. First-morning samples are often more acidic due to overnight fasting. Your doctor may request specific timing for your test to ensure accurate interpretation.
  1. 1
    MedlinePlus - Urine pH TestSource
  2. 2
    Mayo Clinic - UrinalysisSource
  3. 3
    National Kidney Foundation - UrinalysisSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy