test tube

Iodide in Blood

€ 40,00

This test measures iodide in the blood, reflecting the amount available for thyroid hormone synthesis. It is useful for evaluating iodine status in combination with thyroid function tests, and as a complement to urinary iodine analysis

Your test at a glance

Sample
Blood
Results from receipt
Usually 3–10 days
Fasting
Check your WHL instructions before collection

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 notes

One 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.

- +
SKU: ILT-LT-1 Category: Tags:

Description

What it measures

  • Iodide circulating in the blood (either in serum or whole blood).
  • Reflects the amount of iodine available for immediate thyroid hormone synthesis and transport.

Why it matters

  • Unlike urine tests, which show how much iodine is excreted, blood iodide reflects current circulating levels and may indicate whether enough is available for thyroid uptake.
  • Whole blood iodide includes both plasma and intracellular fractions, giving a more stable picture than serum alone.

Clinical applications

  • Assessing acute iodine status in patients with thyroid symptoms.
  • Monitoring iodine supplementation (together with thyroid function tests).
  • Complementary to urine testing:
  1. Urine = output/excretion (how much iodine leaves the body).
  2. Blood = circulating availability (how much iodine is currently accessible to the thyroid).
  • Useful in patients with kidney disease, where urinary iodine might be misleading.

Practical details

  • Sample type: Whole Blood or capillary blood via Tasso device (for at-home collection).
  • Turnaround time: 7–10 working days.
  • Reference values: Typically around 40–90 µg/L for serum iodide (may vary by lab population).

Limitations

  • Whole blood iodide is stable but requires careful sample handling.
  • Should always be interpreted alongside thyroid hormones (TSH, free T4, free T3).

 

  • Sample requirement: Whole blood sample

Suitable for postal submission.

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: Blood

Fasting: Check your WHL instructions before collection

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.

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.

Read WHL’s general preparation and reporting guidance

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

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.

Related products