Potassium intake measurement (24-hour urine collection)
This test measures how much potassium you excrete in your urine over a 24-hour period. It helps assess how well your kidneys are handling potassium balance, especially if you have kidney disease, certain medications, or conditions affecting fluid balance.
["This test helps doctors check if your kidneys are removing enough potassium from your body."]
Key facts at a glance
- LOINC
- 9074-6
- Short code
- Potassium intake Measured
- Synonyms
- Potassium intake Measured
- Category
- electrolyte
- Sample
- serum
- Container
- Red-top tube (SST)
- 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
- Method
- measured
- CPT
- 84132
- SNOMED
- 110742001
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters
Potassium is an essential electrolyte that helps regulate heart rhythm, muscle function, and nerve signals. If your body retains too much potassium (hyperkalemia) or loses too little (hypokalemia), it can lead to serious health issues. A 24-hour urine potassium test helps determine whether your kidneys are functioning properly in removing excess potassium.
What to Expect Before the Test
You’ll collect all of your urine for a full 24-hour period, typically starting after midnight one day and ending the same time the next day. Drink plenty of fluids to ensure adequate urine production. Avoid certain medications or supplements that may affect potassium levels, as instructed by your healthcare provider.
How the Test Works
The collected urine is sent to a lab, where potassium levels are measured. This test provides an accurate picture of your body’s potassium excretion, which can’t be fully captured by a single blood test.
Common Reasons for Testing
Doctors may order this test if you have symptoms like muscle weakness, irregular heartbeat, or signs of kidney problems. It’s also used to monitor kidney function in patients with conditions like diabetes, heart disease, or those on certain medications that affect potassium levels.
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.
◆Associated findings1
Short name
24-Hour Urine Potassium Test
Frequently asked questions
How long does it take to get results?
What does a low urine potassium level mean?
What does a high urine potassium level mean?
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