Quick Facts
- Sample: Urine (24-hour collection)
- Fasting: No fasting required
- Turnaround: 3-5 days (may take longer based on weather, holiday, or lab delays)
What This Test Measures
This test measures the amount of iodine in your urine, collected over a full 24-hour period. Iodine is a mineral your body needs to produce thyroid hormones, which help regulate energy and growth. This test provides a quantitative measurement of iodine excreted in urine over the collection period, reflecting your overall iodine intake and status.
Because the sample is collected continuously over 24 hours rather than as a single random void, the result reflects your iodine excretion across a full day, not just a single point in time. Your healthcare provider can use this measurement to help evaluate whether your iodine levels are within an expected range.
Benefits
- Checks whether your iodine intake may be too low or too high
- Reflects iodine excretion across a full 24-hour period
- Supports evaluation of thyroid-related symptoms alongside other findings
- Helps assess dietary iodine intake over time
- Provides a quantitative urine iodine measurement for your provider
Who Is This Test For?
- People experiencing symptoms associated with thyroid problems
- Individuals with persistent, unexplained fatigue
- People with unexplained changes in body weight
- Pregnant women wanting to check their iodine status
- Individuals following diets that may be low in iodine
- People with general dietary concerns about iodine intake
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this test?
This test measures the amount of iodine excreted in your urine over a 24-hour period. Iodine is essential for producing thyroid hormones, which help regulate your body's energy and growth. The result may help your healthcare provider evaluate whether your iodine intake is adequate, low, or excessive as part of a broader clinical picture.
2. Who would benefit from this test?
This test may be useful for people with thyroid-related symptoms, unexplained fatigue, or unexplained weight changes. It may also benefit pregnant women who want to confirm adequate iodine intake, and individuals with dietary concerns or restricted diets who want to check their iodine status.
3. When should I order this test?
You might consider this test if you have symptoms that could relate to thyroid function, such as fatigue, weight changes, or neck swelling. It may also be useful if you follow a restricted diet, have dietary concerns about iodine, or are pregnant and want to check your iodine intake.
4. What does this test measure?
This test provides a quantitative measurement of iodine in a urine sample collected continuously over 24 hours. The result reflects the total amount of iodine excreted during that period, offering a picture of your iodine status over a full day rather than a single moment. It does not include measurement of thyroid hormones or other thyroid-related substances.
5. Do I need to fast before this test?
No fasting is required for this test. You will need to obtain a specimen container from the lab before beginning your urine collection.
6. How quickly will I get results?
Results are typically available in 3-5 days, though this may take longer depending on weather, holidays, or other lab delays.
7. How do I interpret the results?
Interpreting your iodine urine result depends on your individual health history, diet, symptoms, and other laboratory findings. Because this is a timed 24-hour urine collection, the accuracy of the result also depends on complete and proper collection. An abnormal result does not automatically confirm a specific condition, and a normal result does not rule one out. Your healthcare provider is best positioned to interpret your result in the context of your overall health.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
8. What should I do if my results are abnormal?
If your results fall outside the expected range, review them with a qualified healthcare provider. They can help determine what the result may mean for you and whether any additional evaluation is appropriate based on your health history and symptoms.
9. How often should I get tested?
There is no set schedule for repeating this test. How often you may need retesting depends on your individual health situation, so follow the guidance of your healthcare provider.
Pre-test preparation
You must take your lab order to the lab to obtain a proper specimen container before collection. No fasting required. Urinate at 8am and discard the specimen. Then collect all urine in a 24-hour period, ending with final collection at 8am the next morning. Refrigerate the collected urine between all voidings or keep it in a cool place. Screw the lid on securely. Transport the specimen promptly to the laboratory. The container must be labeled with your full name, date and time collection started, and date and time collection finished.
