24-Hour Urinary Potassium Excretion Rate
This test measures how much potassium your body excretes in urine over a 24-hour period. It helps assess kidney function and electrolyte balance.
["This test helps doctors check if your kidneys are properly removing potassium from your body."]
Key facts at a glance
- LOINC
- 6792-6
- Short code
- Potassium 24h Stl-sRate
- Synonyms
- Potassium 24h Stl-sRate
- Category
- electrolyte
- Sample
- stool
- Container
- Clean container
- Units
- N/A
- Ref low
- 3.5
- Ref high
- 5
- Critical range
- 2.5 N/A – 6.5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84132
- SNOMED
- 110742001
- Specimen volume
- 5 g
- Stability
- Refrigerated: 24h, Frozen: 7d
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your doctor may order this test if you have symptoms like muscle weakness, cramps, or irregular heartbeat, or if you have conditions affecting kidney function or electrolyte balance, such as kidney disease, heart problems, or certain medications that alter potassium levels.
What to Expect Before the Test
No special preparation is needed. You’ll collect all your urine for 24 hours, starting from one point in the morning and ending the same time the next morning. Store the urine in a refrigerator or cool container until testing.
How the Test Is Done
You’ll urinate into a special container every time, keeping track of all urine output. The collected urine is then sent to a lab for analysis to determine the total potassium excreted over the day.
What the Results Mean
Results help determine if your kidneys are removing potassium efficiently. Abnormal results may indicate kidney issues, improper diet, or conditions like diabetes or heart disease.
Reference range
Adult: 3.5-5.0 mmol/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: This test is critical for diagnosing and monitoring conditions affecting potassium balance, such as kidney disease, hyperaldosteronism, or certain medications that alter potassium excretion. Low or high rates may signal underlying health risks requiring medical attention.
Short name
24h Potassium Urine Rate
Frequently asked questions
What causes a low potassium level in urine?
What does a high potassium excretion rate mean?
Can diet affect this test result?
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