Unspecified Substance Concentration in Urine (24-Hour Collection)
This test measures the amount of a specific substance found in your urine over a 24-hour period. It helps assess how much of this substance your body is producing or eliminating.
["A 24-hour urine test provides a full picture of your body’s substance levels over time."]
Key facts at a glance
- LOINC
- 87019-6
- Short code
- Guided Unsp region Drain+cath place
- Synonyms
- Guided Unsp region Drain+cath place
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- imaging-modality
- 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 Might Be Ordered
Your healthcare provider may recommend this test to check for conditions affecting how your body processes or removes certain substances, such as kidney function, hormone levels, or metabolic disorders. It could also be used to monitor treatments for conditions like diabetes, kidney disease, or certain cancers.
How the Test Works
You’ll collect all your urine for a full day, typically in multiple containers. The sample is then analyzed in a lab to determine the total amount of the substance in your urine over that period.
Sample Collection Process
You’ll need to start collecting urine immediately after waking up (or at a specified time) and continue until you’ve collected urine for 24 hours. Empty your bladder before starting, then use a special container to catch all urine passed during the day and night. Label each container with the time and date.
What to Expect Before the Test
Follow your healthcare provider’s instructions carefully. Avoid certain medications or foods that might affect the test results. Drink enough water to maintain normal urine output but avoid excessive intake that could dilute the sample.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Results can help diagnose or monitor conditions like kidney disease, certain metabolic disorders, or the effectiveness of treatments for conditions such as diabetes or hormonal imbalances. Abnormal results may indicate issues with how your body processes or excretes the measured substance.
Frequently asked questions
What Does a Normal Result Mean?
How Long Does It Take to Get Results?
Can I Drink Alcohol Before the 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