Thyroid Function - Diagnosis and Monitoring

This test evaluates your thyroid gland's function by measuring Thyroid Stimulating Hormone (TSH) and Free T4 levels — commonly known as a TSH blood test — to help diagnose and monitor thyroid disorders.

Symptoms of an Underactive Thyroid (Hypothyroidism)

• Fatigue
• Dry skin
• Hair thinning
• Weight gain
• Cold sensitivity
• Heavy periods
• Reduced fertility
• Memory loss
• Depression

Symptoms of an Overactive Thyroid (Hyperthyroidism)

• Unexplained weight loss
• Increased sweating
• Tremors
• Heat sensitivity
• Reduced libido

Who Should Get This Test?

• Anyone experiencing thyroid disorder symptoms
• Adults over 60, particularly women
• Individuals with Type 1 Diabetes, Addison's Disease, or Coeliac Disease
• Those taking Lithium or Amiodarone medications
• Pregnant women

How Is the Sample Collected?

Samples can be collected via a finger-prick home sample or a phlebotomy sample at one of our partner locations.

Frequently Asked Questions

What is a TSH blood test?

TSH stands for Thyroid Stimulating Hormone. This test measures TSH alongside Free T4 to check whether your thyroid gland is functioning normally, underactive (hypothyroidism), or overactive (hyperthyroidism). It's the same test as thyroid function testing.

What are the symptoms of an underactive or overactive thyroid?

Underactive thyroid (hypothyroidism) symptoms include fatigue, dry skin, hair thinning, weight gain, cold sensitivity, heavy periods, reduced fertility, memory loss and depression. Overactive thyroid (hyperthyroidism) symptoms include unexplained weight loss, increased sweating, tremors, heat sensitivity and reduced libido.

Who should get a thyroid function test?

Testing is recommended for anyone experiencing thyroid disorder symptoms, adults over 60 (particularly women), people with Type 1 Diabetes, Addison's Disease or Coeliac Disease, those taking Lithium or Amiodarone, and pregnant women.