Thyroid Function Tests – Is Your Thyroid Slowing You Down?
By Tharb Faisl
What Is the Thyroid and Why Does It Matter? The thyroid is a small butterfly-shaped gland in your neck that produces hormones essential for:
- Energy metabolism
- Mood regulation
- Weight control
- Heart rate
- Fertility and menstruation
- Skin and hair health
When your thyroid is underactive (hypothyroidism) or overactive (hyperthyroidism), it can disrupt your entire system.
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What Do Thyroid Function Tests Measure?
| Test | What It Checks |
| TSH (Thyroid-Stimulating Hormone) | The brain’s signal to the thyroid. High = underactive; Low = overactive. |
| Free T4 (Thyroxine) | Main thyroid hormone. Low levels = sluggish metabolism. |
| Free T3 (Triiodothyronine) | More active form; often tested in hyperthyroid cases. |
| Thyroid Antibodies (TPO, TgAb) | Screen for autoimmune thyroid disorders like Hashimoto’s or Graves’ disease. |
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Symptoms of Thyroid Imbalance
Underactive Thyroid (Hypothyroidism):
- Constant tiredness
- Weight gain
- Low mood or depression
- Cold sensitivity
- Hair thinning
- Irregular periods
Overactive Thyroid (Hyperthyroidism):
- Unexplained weight loss
- Anxiety, jitteriness
- Racing heart
- Heat sensitivity
- Sweating or tremors
- Insomnia
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Included In These Marylebone Panels
Well Woman XX Profile (£199)
Marylebone Health Screening Profile (£229)
Standalone Thyroid Function Test – from £49
Add-on to hormone, fertility, or fatigue profiles
Located near Baker Street, just a walk from Harley Street, Euston, and Kings Cross.
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Why Regular Testing Matters
Thyroid problems are especially common in women, often triggered by stress, post-pregnancy changes, or autoimmune issues. Left untreated, thyroid disorders can lead to:
- Fertility issues
- Chronic fatigue
- Mental health disorders
- Irregular menstruation
- Heart rhythm disturbances
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Real Patient Insight
“For years I thought I was just tired and stressed. A thyroid test at Marylebone showed I had Hashimoto’s. I finally had a name for it — and started treatment.”
— Leila, 35, Paddington
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FAQs – Thyroid Function Testing
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Don’t Wait for a Diagnosis – Take Control Today
Thyroid imbalances can be mild but life changing. The good news? They’re easy to detect — and manageable once diagnosed.
Get peace of mind at Marylebone Diagnostic Centre
Speak with our care team if symptoms match
Add it to your general health screen
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Read More:
➤ British Thyroid Foundation – About the Thyroid
➤ Lab Tests Online UK – Thyroid Function Tests
