Thyroid Profile Total
Test code: BCM0572
- Sample
- Blood
- Preparation
- No special preparation
- Processed
- Mon to Sun, by 06:00 PM
About this test
The Thyroid Profile (Total) measures Total T3, Total T4 and TSH to check how well your thyroid gland is working. It is used to detect an underactive thyroid (hypothyroidism) or an overactive thyroid (hyperthyroidism), and to monitor people already on thyroid treatment.
Preparation & sample
No special preparation required. If you take thyroid medicine, give your sample before your morning dose unless your doctor says otherwise. Biotin supplements (often found in hair, skin and nail products) can affect thyroid results, so ask your doctor whether to stop them 2 to 3 days before the test.
What does this test measure?
- TSH (Thyroid Stimulating Hormone): made by the pituitary gland in the brain. It tells the thyroid how much hormone to produce, and is usually the most sensitive marker of a thyroid problem.
- Total T4 (Thyroxine): the main hormone made by the thyroid
- Total T3 (Triiodothyronine): the more active form of thyroid hormone, mostly made from T4 in the body
When should you get this test?
- Unexplained tiredness, weight gain or loss, or feeling unusually cold or hot
- Hair fall, dry skin, constipation, or a puffy face
- Fast heartbeat, anxiety, tremors or trouble sleeping
- Irregular periods, difficulty conceiving, or during pregnancy
- A swelling in the neck (goitre) or a family history of thyroid disease
- To check your dose if you are already on thyroid medicine
Understanding your results
TSH and the thyroid hormones usually move in opposite directions:
- High TSH with low T4/T3 suggests an underactive thyroid (hypothyroidism).
- Low TSH with high T4/T3 suggests an overactive thyroid (hyperthyroidism).
- An abnormal TSH with normal T4/T3 is called subclinical thyroid disease. Doctors often repeat the test after a few weeks before deciding on treatment.
Reference ranges differ during pregnancy and with age. Your doctor will interpret the results along with your symptoms.
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