TSH-ultra sensitive
Test code: BCM0587
- Sample
- Blood
- Preparation
- No special preparation
- Report
- Within 3 Hours
- Processed
- Mon to Sun, by 06:00 PM
About this test
The TSH (Ultrasensitive) test measures Thyroid Stimulating Hormone, the hormone that tells your thyroid how much to work. It is the most sensitive single test to screen for an underactive or overactive thyroid, and is widely used to adjust the dose of thyroid medicine.
Preparation & sample
No special preparation required. In follow-up tests, give your sample at the same time of day as your previous test. If you take thyroid medicine, give your sample before your morning dose unless your doctor says otherwise. Biotin supplements can affect the result, so ask your doctor whether to stop them 2 to 3 days before the test.
What does this test measure?
It measures TSH, a hormone made by the pituitary gland in the brain. When thyroid hormone levels fall, TSH rises to push the thyroid to work harder; when they are too high, TSH drops. The ultrasensitive method can detect very low TSH levels accurately, which helps identify an overactive thyroid.
When should you get this test?
- Tiredness, weight changes, hair fall, dry skin or feeling cold (possible underactive thyroid)
- Fast heartbeat, anxiety, weight loss, tremors or heat intolerance (possible overactive thyroid)
- Irregular periods, difficulty conceiving, planning pregnancy or during pregnancy
- A family history of thyroid disease or a swelling in the neck
- To check your dose 6 to 8 weeks after starting or changing thyroid medicine
Understanding your results
- High TSH usually means the thyroid is underactive (hypothyroidism).
- Low TSH usually means the thyroid is overactive (hyperthyroidism), or that the dose of thyroid medicine is too high.
- If TSH is abnormal, your doctor may add Free T4 and Free T3 tests to confirm the diagnosis.
Reference ranges are different in pregnancy, and TSH can change temporarily with illness or some medicines. Your doctor will look at the result together with your symptoms.
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