A private thyroid test is one of the quickest ways to explain symptoms like unexplained tiredness, weight changes, feeling cold, low mood or a racing heart. At Premier Private GP you can book a thyroid blood test online in minutes, be seen within days at our CQC-registered Surrey clinic, and — importantly — have your results reviewed and explained by a GMC-registered GP, with clear next steps.
What a Thyroid Test Checks
A thyroid blood test measures the hormones that control your metabolism. Three markers tell the full story:
Thyroid-Stimulating Hormone
The pituitary's signal to the thyroid. Elevated TSH suggests an under-active thyroid; suppressed TSH suggests over-activity. Always measured first.
Thyroxine (Free T4)
The main hormone the thyroid produces. Measured alongside TSH to confirm the diagnosis and assess severity.
Triiodothyronine (Free T3)
The active form of thyroid hormone. Checked when T4 results are borderline or symptoms persist despite normal TSH and T4.
Together, TSH, T4 and T3 show whether your thyroid is under-active (hypothyroidism), over-active (hyperthyroidism), or functioning normally — and help guide the right treatment if needed.
Symptoms of a Thyroid Problem
Thyroid conditions are among the most commonly missed diagnoses because their symptoms overlap with dozens of other conditions — including fatigue, depression, anxiety, and perimenopause. A blood test removes the guesswork.
- Persistent tiredness and fatigue
- Unexplained weight gain
- Feeling cold all the time
- Dry skin and brittle hair
- Low mood or depression
- Constipation
- Brain fog, poor memory
- Slow heart rate
- Unexplained weight loss
- Racing or irregular heartbeat
- Feeling hot or sweating excessively
- Anxiety or nervousness
- Hand tremor
- Trouble sleeping
- Increased appetite
- Frequent bowel movements
Who Should Consider a Private Thyroid Test?
Anyone experiencing symptoms of an under- or over-active thyroid — especially unexplained fatigue, weight changes, or mood disruption
Anyone with a family history of thyroid disease — hypothyroidism and hyperthyroidism run in families
Women during or after pregnancy — thyroid disorders are more common postpartum and can be mistaken for postnatal depression
Anyone wanting a baseline health check — thyroid function is a standard marker in comprehensive private health blood test panels
How It Works at Premier Private GP
We have designed the process to be straightforward, fast, and fully GP-supervised — unlike online test kits where you interpret results without clinical support.
Book onlineChoose your appointment and pay securely in minutes. No referral needed.
Blood drawA trained phlebotomist takes your sample at our Bagshot clinic. Quick and straightforward.
Accredited labYour sample is processed at a CQC-accredited laboratory, with results typically ready within a few days.
GP reviewA GMC-registered GP reviews your results and gives you a clear, personalised explanation with next steps.
