Iodine (Serum)
Private Iodine (Serum) blood test in London for £205, measuring one specialist iodine marker with results expected in around 1 week.
Turnaround time
1 week
Biomarkers count
1
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Overview of the Iodine (Serum)
The test contains 1 biomarker: Iodine - Serum.
Iodine is an essential trace element required for the production of thyroid hormones.
The thyroid gland incorporates Iodine into Thyroxine (T4) and Triiodothyronine (T3), hormones that regulate metabolism, growth, temperature control and many aspects of normal physiology.
Both insufficient and excessive Iodine exposure can affect thyroid function.
Iodine deficiency can impair thyroid-hormone production and, when substantial, contribute to thyroid enlargement or hypothyroidism.
Excessive Iodine can also disturb thyroid function, particularly in susceptible individuals or people with existing thyroid disease.
Serum Iodine reflects circulating Iodine and may be useful in specialist assessment of deficiency, supplementation or excessive exposure.
However, Iodine status can be difficult to interpret from a single blood measurement.
Urinary Iodine is frequently used in population-level nutritional assessment because most dietary Iodine is excreted through the kidneys, although individual urine results can also vary considerably from day to day.
Serum Iodine can be affected by supplements, recent contrast agents and Iodine-containing medicines such as Amiodarone.
For this reason, the result should be interpreted alongside diet, supplements, medication and thyroid-function tests rather than used alone to diagnose thyroid disease.
What Does the Iodine (Serum) Test Check?
This specialist test measures the amount of Iodine present in the serum and can provide information about Iodine exposure and nutritional status in the appropriate clinical context. This test measures 1 biomarker.
Iodine - Serum
Measures circulating serum Iodine to support specialist assessment of Iodine status, supplementation or excessive exposure relevant to thyroid physiology.
Who May Benefit From the Iodine (Serum) Test?
Serum Iodine testing may be useful when dietary intake, supplementation, thyroid health or medication raises a specific question about Iodine status.
People with highly restricted diets and possible low Iodine intake - Iodine intake may be reduced when common dietary sources are excluded.
People following vegan diets without reliable Iodine sources - Plant-based diets can be low in Iodine unless fortified foods or appropriate supplementation are used.
People taking high-dose Iodine supplements - Excessive intake can affect thyroid function.
People taking kelp or seaweed supplements regularly - Iodine content can be high and highly variable.
People with thyroid abnormalities where Iodine status is specifically being investigated - Serum Iodine may provide additional nutritional context.
People taking Amiodarone - This medicine contains a substantial Iodine load and can influence thyroid physiology.
People with recent unusual Iodine exposure - Specialist testing may be appropriate where excess exposure is suspected.
People with a previous abnormal Iodine measurement - Repeat testing can assess whether the concentration has changed.
How to Prepare
Do not stop prescribed Amiodarone or thyroid medication simply to alter the Iodine result.
Avoid adding large doses of Iodine immediately before testing unless medically prescribed.
Symptoms and Reasons to Consider the Iodine (Serum) Test
Iodine imbalance does not produce a unique symptom pattern because its major clinical effects occur through changes in thyroid physiology.
Symptoms of possible hypothyroidism with suspected nutritional deficiency - Inadequate Iodine is one possible contributor but should be assessed with thyroid hormones.
Unexplained thyroid enlargement - Iodine deficiency is one of several possible causes of goitre.
Fatigue, cold intolerance or weight change with thyroid concerns - Thyroid-function testing is more direct, while Iodine may provide nutritional context.
Symptoms developing during high-dose Iodine supplementation - Excessive Iodine can affect thyroid function in susceptible people.
Unexpected thyroid abnormalities while taking kelp or seaweed products - Supplement-related Iodine exposure may be relevant.
Thyroid changes during Amiodarone treatment - The medication's Iodine content can contribute to both underactive and overactive thyroid patterns.
These symptoms cannot establish Iodine deficiency or excess.
Significant thyroid symptoms should be assessed with TSH, Free T4 and, where appropriate, Free T3 and thyroid antibodies rather than relying on serum Iodine alone.
How to Book Your Iodine (Serum) Test
The Iodine (Serum) test can be booked privately where a specialist blood-based assessment of Iodine status or exposure is required.
Choose the Iodine (Serum)
Select the individual Serum Iodine blood test online.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy.
Attend your appointment
A trained healthcare professional collects the required venous blood specimen.
Laboratory analysis
Your serum undergoes specialist trace-element measurement for Iodine.
Receive your results securely
Your authorised Iodine result is delivered securely and can be interpreted alongside thyroid-function and exposure information.
When Will I Receive My Results?
The current expected turnaround for Iodine (Serum) is approximately 1 week after your sample reaches the laboratory.
Serum Iodine requires specialist trace-element analysis rather than routine automated thyroid testing.
The specimen undergoes dedicated analytical processing, laboratory quality control and result authorisation.
Turnaround begins from laboratory receipt rather than necessarily from the time your blood is collected.
Specialist referral schedules or repeat analysis can occasionally extend the reporting period.
Understanding Your Results
A lower Serum Iodine result may indicate lower circulating Iodine exposure, but interpretation depends on diet, timing, supplementation and the laboratory method.
A higher concentration may reflect supplementation, high dietary exposure, recent Iodinated contrast or Iodine-containing medication.
Neither a low nor high Serum Iodine result automatically establishes thyroid dysfunction.
The effect of Iodine on thyroid health is better understood when the result is considered with TSH, Free T4, Free T3 and relevant thyroid antibodies.
Where dietary deficiency is suspected, nutritional history is important.
Where excess is suspected, every supplement and medication source should be reviewed because Iodine may be present in products not specifically marketed as thyroid supplements.
Why Book With London Blood Tests?
This test provides specialist private measurement of an essential trace element closely linked to thyroid-hormone production.
Specialist Serum Iodine measurement - Measures circulating Iodine directly.
Relevant to thyroid nutrition - Iodine is essential for production of T4 and T3.
Useful for supplementation assessment - Can provide information where substantial Iodine intake is occurring.
Relevant to possible excessive exposure - High-dose supplements, seaweed products and some medicines can provide large Iodine loads.
Useful alongside thyroid testing - Can complement TSH and thyroid-hormone measurements.
Specialist laboratory analysis - Samples undergo dedicated trace-element testing.
Private phlebotomy in London - Clinic and mobile collection options are available.
Clear pricing - Iodine (Serum) costs £205.
Private Iodine (Serum) Blood Test in London
London Blood Tests provides private Serum Iodine testing in London for people requiring specialist assessment of Iodine status or exposure.
The test costs £205 and measures 1 biomarker: Iodine - Serum.
Results are expected approximately 1 week after laboratory receipt.
The result should be interpreted alongside diet, supplements, medication and thyroid-function testing rather than used independently to diagnose thyroid disease.