Concierge nuclear medicine · London
Thyroid scan, radioisotope imaging of thyroid function and nodule activity.
A thyroid scan uses IV or oral technetium or iodine-123 to map thyroid function and nodule uptake — distinguishing hot from cold nodules, and confirming causes of hyperthyroidism.
Key facts
- 01
Definition
Radionuclide imaging of thyroid gland function and nodule activity.
- 02
30–60 minute study
A short nuclear medicine appointment — tracer, wait, then imaging.
- 03
Tc-99m or I-123
Technetium-99m pertechnetate or iodine-123 as the radiotracer.
- 04
Differentiates hyperthyroidism causes
Separates Graves’, toxic nodule and thyroiditis when TSH is suppressed.
- 05
Foundation for RAI planning
Underpins radioactive iodine (I-131) dose planning and eligibility.
- 06
Complements thyroid ultrasound
Function map that pairs with the anatomical detail of thyroid ultrasound.
How it works
From referral to structured plan — what happens, in order.
A clear diagnostic pathway from endocrine referral through tracer imaging to a written management plan.
- 01
Endocrine consultation
Referral from an endocrinologist to define the diagnostic question — hyperthyroidism cause or nodule activity.
- 02
Withhold thyroxine per protocol
Levothyroxine and anti-thyroid drugs are paused for the appropriate interval to allow accurate uptake.
- 03
Iodine avoidance
Avoid iodinated contrast, kelp and iodine-rich supplements for the specified pre-scan window.
- 04
IV radiotracer
A small IV injection of Tc-99m pertechnetate, or oral iodine-123 depending on the protocol.
- 05
Gamma camera imaging
Planar images of the thyroid bed on a gamma camera, typically 20–30 minutes after tracer.
- 06
Structured report
A consultant nuclear medicine physician reports uptake pattern, nodule activity and calculated uptake if relevant.
- 07
Structured plan
Findings feed the endocrine plan — anti-thyroid drugs, RAI, surgery or FNA for a cold nodule.
What it shows
What a thyroid scan can characterise.
The scan answers a specific question — is uptake diffuse, focal or reduced, and where do individual nodules sit on the hot–cold spectrum.
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Diffuse uptake (Graves’)
Homogeneously increased uptake throughout the gland — the classic Graves’ pattern.
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Toxic nodule
A single hot nodule with suppression of the surrounding gland — Plummer’s disease.
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Toxic multinodular goitre
Patchy hot and cold areas across an enlarged gland with hyperthyroidism.
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Cold nodule
A photopenic area that fails to concentrate tracer — always warrants ultrasound and, usually, FNA.
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Thyroiditis
Globally reduced uptake in the setting of thyrotoxicosis — subacute, silent or post-partum.
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Ectopic thyroid
Functioning thyroid tissue outside the normal bed — lingual or sublingual.
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Retrosternal goitre
Extension of functioning thyroid tissue behind the sternum.
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Red flag: rapid cold nodule growth — urgent FNA
A cold nodule that is enlarging quickly warrants urgent fine-needle aspiration.
Treatment options
What follows the thyroid scan.
The scan defines the endocrine plan — from medical control through definitive treatment to structured long-term follow-up.
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Anti-thyroid drugs
Carbimazole or propylthiouracil as first-line medical control of hyperthyroidism.
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RAI (I-131)
Definitive radioactive iodine ablation for Graves’ and toxic nodular disease.
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Thyroidectomy
Total or hemithyroidectomy — for large goitre, compressive symptoms or malignancy.
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Beta-blocker
Propranolol for symptomatic control of tachycardia and tremor while a plan is finalised.
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Levothyroxine
Post-ablation or post-surgery thyroid hormone replacement, titrated to TSH.
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Endocrine follow-up
Structured biochemical monitoring — TSH, free T4 and antibodies — under endocrinology.
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MDT review
Endocrinology, endocrine surgery, nuclear medicine and radiology joint review for complex cases.
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Genetic counselling (medullary)
RET testing and family counselling where medullary thyroid cancer or MEN 2 is suspected.
Red flags
When something needs urgent specialist input.
The features and clinical contexts that warrant urgent endocrine-surgery, ENT or genetics involvement.
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Rapid cold nodule
A photopenic nodule that grows quickly is a red flag — urgent FNA.
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Fixed nodule
A nodule that is tethered or immobile suggests extra-thyroidal extension.
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Cervical lymphadenopathy
Suspicious neck lymph nodes alongside a nodule change urgency and pathway.
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Vocal cord palsy
Hoarseness with a thyroid mass raises concern for recurrent laryngeal nerve involvement.
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Medullary family history
First-degree relative with medullary thyroid cancer — genetic and biochemical work-up needed.
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MEN 2
Multiple Endocrine Neoplasia 2 — coordinated endocrine, surgical and genetics input.
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Post-radiation neck
Prior head-and-neck radiotherapy raises the pre-test probability of malignancy.
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Solitary cold nodule in child
A cold nodule in a child carries a higher malignancy risk and needs urgent evaluation.
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Thyroid storm
Severe uncontrolled thyrotoxicosis with systemic features — a medical emergency, not an outpatient problem.
Reading your report
A thyroid scan report can look intimidating. It isn’t.
Whatever the finding, the report keeps to the same four parts.
A quiet reminder
The report is written for your endocrinologist, not for you — and that’s normal.
If you would like us to talk you through it before your follow-up, just ask.
- 01 Header
Indication and biochemistry
Your details, referring clinician, TSH/free T4 values and the clinical question.
- 02 Technique
Tracer, dose and imaging phases
Tc-99m pertechnetate or I-123 dose, timing and views obtained on the gamma camera.
- 03 Findings
Uptake pattern and nodule activity
Diffuse, focal or patchy uptake; nodule status (hot, warm or cold); calculated uptake where indicated.
- 04 Impression
The conclusion: read this first
Graves’, toxic nodule, toxic multinodular goitre, thyroiditis or cold nodule — with the concrete next step.
Clinical sources
Who informs this guide.
Recognised by major UK insurers
Cover depends on your policy and clinic; we confirm with your insurer before booking.
Frequently asked
Everything we get asked about thyroid scans.
Quick answers on how the scan works, medication interactions, safety, cold nodules and who reports.
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What is a thyroid scan?
A nuclear medicine study using Tc-99m pertechnetate or iodine-123 to map thyroid gland function and nodule activity — distinguishing hot from cold nodules and confirming causes of hyperthyroidism.
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What is the difference between a thyroid scan and a thyroid ultrasound?
A thyroid scan is a functional test — it shows how the gland and its nodules take up tracer. A thyroid ultrasound is an anatomical test — it characterises structure, size and suspicious features. The two are complementary.
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Why do I need to stop my thyroid medication?
Levothyroxine and anti-thyroid drugs alter tracer uptake and can invalidate the scan. Your endocrinologist will tell you exactly when to pause each medication before the appointment.
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Is a thyroid scan safe?
The radiation dose is low and comparable to other diagnostic nuclear medicine studies. It is not used in pregnancy or breastfeeding without specific indication and specialist discussion.
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What does a cold nodule mean?
A cold nodule is one that fails to take up tracer. Most cold nodules are benign, but the majority of thyroid cancers appear cold — so a cold nodule almost always warrants ultrasound assessment and, usually, fine-needle aspiration.
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Who reports the scan?
A consultant nuclear medicine physician, with the report going to your endocrinologist or endocrine surgeon to guide the next step.
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In practice, in London
The honest picture around thyroid scan in London
With thyroid scan, the London question is usually about report turnaround and the radiologist reading it — not whether the scan is available. Public provision for thyroid scan is competent but constrained by capacity. Private London clinics tend to have shorter diaries and longer appointment slots, so you get the same specialists with more time. For people who’ve been going round in circles with primary care, that first proper conversation is often what shifts things.
Once you’re in the private system for thyroid scan, the pace picks up noticeably. Consultant slots run to time, imaging is usually available in the same building or a short walk away, and the report comes back typed and detailed. It’s the coordination that tends to feel different — one person on the other end of the phone, not a switchboard. For thyroid scan specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.
There are a lot of consultants in London who can technically handle thyroid scan. Fewer who do it week in, week out for the exact question you’re bringing. We spend most of our time working out which is which — and being straight when a different test or a different specialist would serve you better. Everything runs to CQC, GMC and Royal College standards; the choice is about fit, not floor.