24-Hour Urine Intake of a Specific Substance (e.g., Sodium, Potassium, or Water)
This test measures the amount of a substance your body excretes in urine over a full day. It helps doctors assess how much of a particular substance (like minerals, water, or other chemicals) your kidneys filter and remove from your blood.
["Helps track kidney function and fluid balance by measuring daily excretion of specific substances."]
Key facts at a glance
- LOINC
- 81077-0
- Short code
- Vit E intake 24h Measured
- Synonyms
- Vit E intake 24h Measured
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 20
- Ref high
- 400
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- measured
- CPT
- 82670
- 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
What This Test Measures
The test typically involves collecting all urine produced in a 24-hour period. The collected urine is then analyzed to determine the total amount of the measured substance. This helps identify patterns in how your body processes and eliminates substances.
Why It’s Done
Doctors may order this test to evaluate kidney function, diagnose conditions like kidney disease, or check for imbalances in electrolytes (such as sodium, potassium), water retention, or metabolic issues.
Sample Collection and Preparation
You’ll need to collect every drop of urine for 24 consecutive hours, starting and ending at the same time each day. Store the urine in a clean container and keep it refrigerated until you return it to the lab. Proper collection ensures accurate results.
Common Conditions Monitored
This test is often used to monitor conditions like hypertension (high blood pressure), kidney disease, heart failure, or metabolic disorders. It can also help assess how well your body handles fluids and electrolytes.
Reference range
Premenopausal: 20-400 pg/mL; Postmenopausal: <30 pg/mLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical significance: This test provides critical insights into kidney function and fluid balance. Abnormal results may indicate kidney damage, electrolyte imbalances, or other systemic health issues that require medical attention.
Short name
24h Urine Measurement
Frequently asked questions
Why is my doctor asking for this test?
What does a high or low result mean?
How long will I need to prepare for 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