Thyroid Profile 1 (FT4/TSH)

Thyroid Profile 1 (FT4/TSH):
Free T4 (Thyroxine) and TSH Blood Test
Check Your Thyroid Function from Home

The Free T4 (Thyroxine) and TSH Blood Test measures two key hormones involved in thyroid function to help assess whether your thyroid gland is working normally. Thyroid hormones play a vital role in regulating metabolism, energy levels, body temperature, heart rate, weight management, and overall wellbeing.

This convenient home blood test provides accurate laboratory analysis of your thyroid hormone levels, helping identify potential thyroid disorders such as hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid).

What Is the Thyroid Gland?

The thyroid is a butterfly-shaped gland located in the front of the neck. It produces hormones that control many essential bodily functions, including metabolism, growth, energy production, and temperature regulation.

When the thyroid produces too little or too much hormone, a wide range of symptoms can develop that may affect physical and mental health.

What Does This Test Measure?
Thyroid-Stimulating Hormone (TSH)

TSH is produced by the pituitary gland and signals the thyroid to produce thyroid hormones. TSH is often the most sensitive marker of thyroid function.

High TSH levels may indicate an underactive thyroid (hypothyroidism), while low TSH levels may suggest an overactive thyroid (hyperthyroidism).

Free T4 (Free Thyroxine)

Free T4 is the active, unbound form of thyroxine circulating in the bloodstream. Measuring Free T4 helps determine how much thyroid hormone is available for the body’s tissues to use.

Free T4 levels are interpreted alongside TSH to provide a more complete picture of thyroid health.

Why Test Your Thyroid Function?

A thyroid function test can help investigate symptoms that may be associated with thyroid hormone imbalance.

Symptoms of an Underactive Thyroid (Hypothyroidism)
Persistent fatigue
Weight gain
Feeling cold
Dry skin
Hair thinning or hair loss
Depression or low mood
Constipation
Slow heart rate
Memory and concentration problems
Symptoms of an Overactive Thyroid (Hyperthyroidism)
Unexplained weight loss
Increased sweating
Anxiety or nervousness
Rapid heartbeat
Tremors
Difficulty sleeping
Frequent bowel movements
Heat intolerance
Irritability
Who Should Consider This Test?

This test may be suitable for:

Individuals experiencing symptoms of thyroid dysfunction
People with unexplained fatigue or weight changes
Those with a family history of thyroid disease
Women planning pregnancy or experiencing fertility difficulties
Individuals monitoring known thyroid conditions
Patients taking thyroid medication
Anyone wanting a routine thyroid health assessment
Common Thyroid Conditions
Hypothyroidism

Hypothyroidism occurs when the thyroid gland does not produce enough hormones. Common causes include autoimmune thyroid disease (Hashimoto’s thyroiditis), thyroid surgery, and certain medications.

Hyperthyroidism

Hyperthyroidism occurs when the thyroid produces excessive hormones. Common causes include Graves’ disease, thyroid nodules, and thyroid inflammation.

Subclinical Thyroid Disease

Some individuals may have abnormal TSH levels despite normal thyroid hormone levels. Early detection can help identify developing thyroid disorders before symptoms become severe.

Why Are TSH and Free T4 Tested Together?

Testing both TSH and Free T4 provides a comprehensive assessment of thyroid function.

By evaluating these hormones together, healthcare professionals can:

Detect underactive thyroid conditions
Identify overactive thyroid disorders
Monitor thyroid treatment effectiveness
Investigate unexplained symptoms
Support fertility and pregnancy assessments
Sample Type
Finger-prick blood sample
Simple home collection
Return to our accredited laboratory using the prepaid envelope provided
Laboratory Analysis

Your sample is analysed by an accredited UK laboratory using validated testing methods to provide accurate and reliable thyroid hormone measurements.

Understanding Your Results

Your results report will include:

TSH level
Free T4 level
Laboratory reference ranges
Identification of results outside the normal range

Results should always be interpreted in conjunction with symptoms, medical history, and any medications you may be taking.

Benefits of the Repose Healthcare Free T4 and TSH Test

✓ Convenient home sample collection

✓ No GP appointment required

✓ Fast and confidential results

✓ UK accredited laboratory testing

✓ Supports early thyroid health assessment

✓ Helps investigate fatigue, weight changes, and hormonal symptoms

✓ Suitable for both men and women

Frequently Asked Questions
What is TSH?

TSH (Thyroid-Stimulating Hormone) is produced by the pituitary gland and regulates thyroid hormone production.

What is Free T4?

Free T4 is the active form of thyroxine available for use by the body’s tissues and organs.

Can thyroid problems cause fatigue?

Yes. Both underactive and overactive thyroid conditions can contribute to tiredness, low energy, and reduced wellbeing.

Can thyroid disorders affect weight?

Yes. Hypothyroidism is commonly associated with weight gain, while hyperthyroidism often causes unexplained weight loss.

Should I take this test if I am taking thyroid medication?

Yes. Measuring TSH and Free T4 can help monitor the effectiveness of thyroid treatment and determine whether hormone levels remain within target ranges.

Order Your Free T4 and TSH Blood Test Today

Take control of your thyroid health with a simple and reliable Free T4 and TSH Blood Test from Repose Healthcare. Whether you are experiencing symptoms of thyroid imbalance, monitoring an existing condition, or seeking reassurance about your health, our home testing kit provides professional laboratory analysis and confidential results you can trust.