Check your thyroid function from the comfort of home. TSH, Free T3, Free T4 and thyroid antibodies tested with a professional venous blood draw.
Find a Phlebotomist →A comprehensive thyroid panel checks the hormones that regulate your metabolism, energy and mood.
| Marker | What It Shows | Normal Range |
|---|---|---|
| TSH | Pituitary signal to thyroid gland | 0.27 - 4.2 mIU/L |
| Free T4 | Main thyroid hormone (thyroxine) | 12 - 22 pmol/L |
| Free T3 | Active thyroid hormone | 3.1 - 6.8 pmol/L |
| TPO Antibodies | Autoimmune thyroid indicator | Below 34 IU/mL |
Persistent tiredness, unexplained weight gain or loss can all point to thyroid dysfunction.
Thyroid disorders are up to 8 times more common in women, especially after 40 or post-pregnancy.
Regular monitoring ensures your levothyroxine or carbimazole dose is correct and your levels are stable.
Autoimmune thyroid conditions like Hashimoto's often run in families. Early screening can detect problems before symptoms worsen.
Enter your postcode, pick a time, and select the thyroid function panel. No GP referral required.
A DBS-checked phlebotomist arrives at your home and collects a venous blood sample in under 10 minutes.
Samples go to an accredited lab the same day. Results typically returned within one to three working days.
Book a morning appointment for the most accurate TSH reading.
If you take thyroid medication, take it after your blood draw, not before.
Biotin supplements can interfere with thyroid results — stop taking them 48 hours before your test.
Stay well hydrated to make the blood draw easier.
Wear loose sleeves for easy access to your arm.
A thyroid function test typically measures TSH (thyroid-stimulating hormone), Free T4 (thyroxine) and Free T3 (triiodothyronine). Some panels also include thyroid antibodies (TPO and TG) to check for autoimmune thyroid conditions such as Hashimoto's thyroiditis or Graves' disease.
Fasting is not strictly required, but many doctors recommend having your blood drawn in the morning before eating for the most consistent TSH reading. TSH levels naturally fluctuate throughout the day, with the highest levels in the early morning.
If you are on thyroid medication, your doctor will typically recommend testing every 6 to 12 weeks after a dose change and every 6 to 12 months once stable. If you have symptoms but no diagnosis, a single test can help identify whether your thyroid is underactive or overactive.
Yes. A venous blood sample collected at home is identical to one collected in a GP surgery or hospital. The same laboratory equipment analyses it and the results are equally reliable. Home collection simply removes the need to travel to a clinic.
An underactive thyroid (hypothyroidism) can cause fatigue, weight gain, dry skin, hair loss, and sensitivity to cold. An overactive thyroid (hyperthyroidism) can cause weight loss, anxiety, tremors, rapid heartbeat, and heat sensitivity. Many of these symptoms overlap with other conditions, which is why a blood test is essential for accurate diagnosis.
Find a DBS-checked phlebotomist near you. Most bookings confirmed in under two minutes.
Find a Phlebotomist →Related reading: Thyroid Function Tests Explained