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Iodine in 24-hour Urine
€ 40,00
This test measures iodine excretion in a 24-hour urine collection and provides insight into iodine status at the individual and population level.
Your test at a glance
- Sample
- 24-hour urine
- Results from receipt
- Usually 3–10 days
- Fasting
- An overnight fast is usually not needed. Follow the kit’s food, drink and collection-timing instructions.
Timing starts when suitable samples arrive at the laboratory. Shipping time is additional. Combined panels may take longer.
Preparation: Pause non-prescribed nutritional supplements for at least 48 hours, unless WHL or your clinician advises otherwise.
WHL will send the full test instructions with your kit or appointment confirmation. Follow these before collecting.
Preparation and important notesOne charge per request. Processing and handling is charged once for the complete request, not for each test or panel. Collection and delivery charges are shown separately at checkout.
Description
What it measures
- Iodine is mostly excreted through urine (up to 90%).
- A 24-hour urine collection is considered the most reliable way to assess recent iodine intake in an individual, especially compared with a random spot urine sample.
Why it matters
- Iodine is essential for thyroid hormone synthesis (T4 and T3).
- Deficiency can cause goiter, hypothyroidism, developmental problems in children, and impaired fertility.
- Excess iodine may trigger thyroid dysfunction in sensitive individuals (e.g., Hashimoto’s, multinodular goiter).
Clinical applications
- Assessing iodine intake in suspected deficiency or excess.
- Monitoring patients on iodine supplementation.
- Evaluating dietary interventions (vegetarian/vegan diets, low-salt diets).
- Research on population iodine status.
Limitations
- Reflects short- to medium-term intake.
- Does not always correlate perfectly with tissue iodine stores.
- Sample requirement: 24-hour urine collection
Suitable for postal submission.
Please note: this is a single iodine measurement in 24-hour urine. For a broader overview of multiple elements, choose the panel ‘Elements in Urine II’.”
Additional information
| Weight | 0,5 kg |
|---|---|
| Dimensions | 25 × 16 × 2,5 cm |
| Sample Type |
Preparing for this test
WHL will send detailed collection, storage and return instructions with your test kit or appointment confirmation. Those test-specific instructions take priority.
Sample: 24-hour urine
Fasting: An overnight fast is usually not needed. Follow the kit’s food, drink and collection-timing instructions.
For nutritional testing, pause non-prescribed supplements, including protein and amino-acid powders, for at least 48 hours unless WHL or your clinician advises otherwise. If monitoring supplements, agree the timing with your practitioner.
Use the supplied 24-hour collection kit and collect throughout the complete period. Follow WHL’s storage and return instructions.
Do not stop prescribed medicines or prescribed supplements without advice from your treating clinician. Tell WHL about high-dose biotin; some tests need a longer pause. A short supplement pause does not remove all effects of long-term use.
If another test in the same order requires fasting, follow the combined instructions. Ask your clinician or WHL before fasting if you have diabetes, use glucose-lowering medicine, are pregnant, or are arranging testing for a child.
When to expect your results
Usually 3–10 days. This estimate starts when suitable samples reach the laboratory, not on the order or collection date. Shipping is additional. WHL will confirm any test-specific exception; a combined panel follows its slowest component.
Practical preparation tips
If fasting is requested, drink only plain water in your usual amounts. Do not have coffee, tea, juice, milk, energy drinks, sweets or chewing gum. Avoid smoking or vaping that morning. Book an early appointment and eat after collection.
For a planned blood test, avoid alcohol and unusually strenuous exercise for 24 hours, where practical, and sit quietly for about 15 minutes before collection. Tell WHL if you could not follow the preparation instructions.
Do not extend fasting or change prescribed medication on your own. Ask your clinician first if you have diabetes, need medicine with food, are pregnant, or are arranging testing for a child. WHL’s full test-specific instructions take priority.
Sources for this general preparation guidance
- Mayo Clinic Laboratories — plasma amino acids
- Mayo Clinic Laboratories — vitamin B6
- Mayo Clinic Laboratories — B12 and folate
- Mayo Clinic Laboratories — vitamins A and E
- Mayo Clinic Laboratories — iron studies
- NHS — fasting blood tests
- EAS/EFLM — fasting and non-fasting lipids
- EFLM/COLABIOCLI — preparation for blood collection
Other laboratories’ methods and preparation rules can differ. These sources support the general advice; WHL confirms the instructions for the method used for your test.
