Radioactivity measurement in urine (pre-radiation therapy, 24-hour collection)
This test checks how much radioactive material is present in your urine after you’ve been exposed to radiation therapy. It helps monitor how your body is processing and eliminating the radiation.
["This test helps track radiation clearance from your body before and during treatment."]
Key facts at a glance
- LOINC
- 33766-7
- Short code
- Radioactivity pre RA B12 Ur Ql
- Synonyms
- Radioactivity pre RA B12 Ur Ql
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Ref low
- 200
- Ref high
- 900
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 10 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may order this test before or during radiation therapy to ensure your body is safely processing the radiation. It helps prevent excessive buildup of radioactive substances that could harm your organs or tissues.
What to Expect During the Test
You’ll collect all urine for a full 24-hour period in a special container. Your healthcare team will provide instructions on proper collection and storage to ensure accurate results.
Sample Collection Process
Start collecting urine immediately after your first dose of radiation therapy. Empty your bladder completely into the container at the start and end of the 24-hour period. Store the sample at room temperature if instructed, or refrigerate if needed.
What the Results Mean
Results show the amount of radioactive material in your urine. Lower levels indicate your body is processing radiation effectively. High levels may signal issues with clearance or require further medical evaluation.
Reference range
NCBI: Vitamin B12 200-900 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.
◆Associated findings1
Short name
Urine Radioactivity (Pre-Rab)
Frequently asked questions
How long will I need to collect urine for this test?
What if I miss any urine during the collection period?
Can I drink alcohol or certain medications during urine collection?
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 17, 2026. · Read our editorial policy