TSH test for detecting an elevated TSH level
If you have persistent tiredness, sensitivity to cold, weight gain or other symptoms that may fit hypothyroidism, the TSH test helps you assess at home whether TSH in finger-prick blood is at least 5 µIU/ml. It does not provide an exact TSH value and cannot by itself diagnose or exclude hypothyroidism.
What does TSH indicate about thyroid function?
TSH is produced by the pituitary gland and stimulates the thyroid to produce thyroid hormones. When thyroid hormone production is insufficient, TSH may rise. An elevated result may therefore indicate primary hypothyroidism. Possible symptoms include tiredness, sensitivity to cold, weight gain, dry skin, brittle hair, constipation and menstrual irregularities.
The test is not intended to assess hyperthyroidism. In central hypothyroidism, TSH may be normal or low, so a negative result does not exclude every thyroid disorder.
When and how is the test performed?
The test may be used at any time of day. According to the instructions, it should not be performed during thyroid hormone treatment. Collect finger-prick blood with the lancet, transfer it with the capillary dropper and add two drops of buffer as instructed. Read the result at 10 minutes and do not interpret it after 20 minutes.
Interpreting the result
What does a positive result mean?
Two lines, C and T, mean that TSH is at least 5 µIU/ml. Consult a doctor; the result may need confirmation with a quantitative laboratory TSH test.
What does a negative result mean?
Only the C line means that TSH is below the test cut-off of 5 µIU/ml. A negative result does not exclude every thyroid disorder. Seek medical advice if symptoms persist.
When is the result invalid?
If the C line does not appear, the result is invalid. Repeat the procedure with a new cassette and follow the instructions for use.
Kit contents
- test cassette
- capillary dropper
- buffer
- alcohol pad
- lancet
- package insert
A timer is also required.
Storage and freezing risk
Store dry at 2–30 °C in the sealed pouch. Do not freeze. During winter, choose pickup-point parcel delivery to reduce the risk of the liquid buffer freezing in transit.
Read more about an underactive thyroid on the NHS website. This test does not assess an overactive thyroid; see the NHS hyperthyroidism guide. See also our other health tests.
Order the TSH test if you have symptoms that may fit hypothyroidism and want to find out whether your TSH level is elevated.
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