Potassium in Urine (24-Hour Collection) – Mass Concentration
This test measures the total amount of potassium, a vital mineral, found in your urine over a 24-hour period.
["Understanding your potassium balance helps manage kidney function and heart health."]
Key facts at a glance
- LOINC
- 110397-7
- Short code
- CANRU
- Synonyms
- Canrenone Msmt Ur
- Category
- chemistry
- Sample
- urine
- Container
- 24-hour urine collection container (sterile, amber-colored, without preservatives) or random urine collection container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–99 years
- Method
- High-Performance Liquid Chromatography (HPLC) with Mass Spectrometry or UV detection
- CPT
- 83789
- SNOMED
- 395196007
- Specimen volume
- 10 mL aliquot from a well-mixed 24-hour urine collection; minimum 5 mL for random urine
- Stability
- Room temperature: 24 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 30 days
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 48–96 hours
- Order
- routine
Why This Test Is Done
Your doctor may order this test to check if your kidneys are properly removing potassium from your body. It’s particularly useful for diagnosing conditions like kidney disease, certain types of heart rhythm disorders, or to monitor treatment for conditions affecting electrolyte balance.
What to Expect Before the Test
You’ll need to collect all urine for 24 hours, starting right after midnight of one day and ending right after midnight the next. Store the urine in a refrigerator and bring the entire sample to the lab. Follow any specific instructions your healthcare provider gives you to ensure accurate results.
What the Results Mean
The results provide a total measure of potassium in your urine, which helps assess how well your kidneys are handling potassium excretion. Abnormal results may indicate issues with kidney function or electrolyte imbalances.
Common Conditions Monitored
This test is often used to evaluate kidney function, especially in patients with chronic kidney disease, or to monitor conditions like hyperkalemia (high potassium levels) or hypokalemia (low potassium levels), which can affect heart health and muscle function.
Reference range
Reference values vary by laboratory methodology; typically reported as mcg/24hr or ng/mL. Consult your laboratory's reference range document for specific values.N/A
No special preparation required. Patients should follow their usual medication regimen unless otherwise directed by their physician. A complete 24-hour urine collection is typically required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
What causes abnormal potassium levels in urine?
How often should I have this test?
Can diet affect this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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