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Private thyroid function panel in London, interpreted by an endocrinologist.

The standard blood panel for suspected thyroid dysfunction - with proper context, correct timing, and an endocrinologist for the interpretation when it matters.

A stethoscope on a clinical desk

Indicative pricing

What a private thyroid panel costs in London.

Indicative ranges across UK pathology labs and endocrinologists.

In short

£120–£240, with results in 24–48 hours.

Test or panel Indicative range
TSH only £45–£90
TSH + free T4 £65–£130
Full thyroid panel (TSH, free T4, free T3) £120–£240
Thyroid antibodies (TPO, TG) £120–£250
Full panel + endocrinologist review £250–£500
Postnatal thyroid check £150–£300

Prices vary by which markers are included, whether antibodies are added, whether an endocrinologist review is included, and whether a phlebotomist comes to you.

The problem

A thyroid result out of context isn’t an answer.

Reference ranges shift with age and pregnancy. Biotin skews the assay. Levothyroxine timing changes the number. Getting the pattern right is the part that matters - that is what matters.

  • A borderline TSH?

    The decision is whether to repeat, add antibodies, or watch - before anyone starts treatment.

  • Planning a pregnancy?

    TSH targets are tighter pre-conception, so results need interpreting against the right range.

  • On levothyroxine?

    The sample needs timing properly, the dose needs reviewing, and your GP should be kept informed.

What it shows

When a thyroid panel is the right test.

The most common situations - plus the one red flag that means A&E, not a private test.

  • Suspected hypothyroidism

    Fatigue, weight gain, cold intolerance, low mood - the classic underactive picture.

  • Suspected hyperthyroidism

    Palpitations, weight loss, tremor, heat intolerance, anxiety - the overactive picture.

  • Postpartum thyroid changes

    Silent or symptomatic swings in the year after delivery - a common and treatable pattern.

  • Subclinical (raised TSH) picture

    A mildly raised TSH with normal T4 - when to repeat, when to treat, when to add antibodies.

  • Pre-pregnancy planning

    TSH targets are tighter before and during pregnancy. Worth checking before conception.

  • Thyroid nodule follow-up

    Function alongside a known nodule, coordinated with ultrasound or scintigraphy.

  • Medication monitoring

    Levothyroxine dose titration, amiodarone or lithium monitoring - done at the right interval.

  • Red flag: thyroid storm

    Fever, severe palpitations, agitation - call 999. This page is for stable, planned testing.

Popular panels

What each option is actually for.

  • TSH only

    The single most informative marker - the right first test for most people.

  • TSH + free T4

    Adds free T4 for a fuller picture where TSH is borderline or symptoms are marked.

  • Full panel (TSH, fT4, fT3)

    The standard workup for suspected hyperthyroidism or unclear patterns.

  • Thyroid antibodies (TPO, TG)

    To pattern-diagnose autoimmune thyroid disease (Hashimoto’s, Graves’).

  • Full panel + endocrinology review

    Panel plus a 60-minute consultation with a consultant endocrinologist.

  • Pre-conception thyroid check

    Timed and interpreted against pre-pregnancy TSH targets.

  • Postpartum thyroid check

    For symptomatic swings in the year after delivery.

  • Amiodarone-induced thyroid check

    Structured monitoring for patients on amiodarone or lithium.

Preparation and practicalities

Small details that change the answer.

A thyroid panel is simple to run - but timing, biotin and dose can change the number, so follow the instructions you are given before the test.

  • Fasting

    Best done fasting where practical, but not essential for a thyroid panel alone.

  • Time of day

    A morning sample is preferred - TSH follows a diurnal rhythm and is highest overnight.

  • Biotin supplements

    Avoid biotin (vitamin B7) for at least 48 hours before the test - it can distort assay results.

  • Levothyroxine timing

    Take your levothyroxine dose AFTER the blood test on the day of the sample.

  • Pregnancy

    Pregnancy has trimester-specific reference ranges - results should be interpreted against the correct one.

  • Postpartum shifts

    Postpartum thyroid shifts are common in the year after delivery and often self-resolve.

  • One-off abnormal result

    A single mildly abnormal result usually deserves a repeat before any decision.

  • Antibodies help

    TPO and TG antibodies help pattern-diagnose autoimmune thyroid disease.

  • Share prior results

    Always share previous thyroid results - trend matters more than a single reading.

Reading your report

A thyroid report looks intimidating. It isn’t.

However many markers are run, the report follows the same four parts.

A UK consultant endocrinologist reviewing a thyroid function panel

A quiet reminder

A reference range is a guide, not a verdict - pattern and trend matter.

If you would like it explained before your follow-up, ask the clinician who ordered the test.

  1. 01 Header

    Indication and medications

    Why the panel was requested, and the medications and supplements that might influence it.

  2. 02 Technique

    Which markers were measured

    The exact assays run - TSH, free T4, free T3, antibodies - and the laboratory that ran them.

  3. 03 Findings

    Each marker against its range

    Each result alongside the age- or trimester-appropriate reference range, with anything outside flagged.

  4. 04 Impression

    Read this first

    Normal, subclinical, overt - and what to do next: repeat, add antibodies, adjust dose, or refer for ultrasound.

Recognised by major UK insurers

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Frequently asked

Common questions about thyroid panels.

Quick answers on markers, fasting, biotin, pregnancy, cost and results.

  • What’s actually in a thyroid function test - and do I need the antibodies?

    The core panel is TSH plus free T4 and free T3 - the pituitary signal and the two circulating thyroid hormones.

  • Do I need to fast before a thyroid blood test?

    Fasting is best where practical but not essential for a thyroid panel alone. A morning sample matters more than fasting.

  • Can biotin supplements affect thyroid results?

    Yes. Biotin (vitamin B7) can distort thyroid assay results. Stop biotin at least 48 hours before the test.

  • Are thyroid reference ranges different in pregnancy?

    Yes. Pregnancy has trimester-specific ranges, particularly for TSH. Your result should be interpreted against the correct range for your stage.

  • What is postpartum thyroiditis?

    A common shift in thyroid function in the year after delivery, sometimes hyperthyroid then hypothyroid then back to normal. It is often self-limiting but always worth checking.

  • How much does a private thyroid test cost in London?

    TSH alone is typically £45–£90, TSH + free T4 £65–£130, a full panel £120–£240, and a full panel with a consultant endocrinologist review £250–£500.

  • Do I need a referral?

    No - most private thyroid panels accept self-referral. For interpretation and any onward step (ultrasound, scintigraphy, medication), an endocrinologist review is worthwhile.

  • When do thyroid antibodies matter?

    When TSH is borderline, when hypothyroidism is suspected in a young woman, in pregnancy or pre-pregnancy planning, and when a firm autoimmune diagnosis will change treatment or monitoring.

  • When should I see a GP urgently?

    Fever, severe palpitations and agitation with a known overactive thyroid can suggest thyroid storm - call 999. New chest pain, breathlessness or severe symptoms warrant urgent assessment.

Related tests

Looking for something else?

In practice, in London

Booking thyroid function panel privately in London - what actually happens

With thyroid function panel, the London question is usually about report turnaround and the radiologist reading it - not whether the scan is available. The NHS route for thyroid function panel is thorough, but the queue is real. Many patients are told to expect anywhere from a handful of weeks to several months, depending on their local trust and how the referral is graded. Going private in London usually collapses that window to a matter of days - often the same week if the diary allows. It isn’t about jumping a queue so much as buying time back while you still have the flexibility to plan around it.

Once you’re in the private system for thyroid function panel, 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. For thyroid function panel specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.

There are dozens of consultants in London who see thyroid function panel - but not all of them are the right fit for every case. The right first appointment saves you from repeating yourself later.