Bio LabThyroid-stimulating hormone (TSH)
Reviewed by Dr. Sanaa Ghoneim, Medical laboratory specialist 21 October 2026
Home sample collection is available for this test
Ask about this test on WhatsAppWhat it measures
TSH (thyroid-stimulating hormone) is made by the pituitary gland in the brain. It tells the thyroid gland to release its own hormones, so measuring it gives important information about how the thyroid is working. Doctors often request the thyroid hormones themselves alongside it, such as free T4 and sometimes T3.
Why a doctor may order it
- Symptoms that may be linked to the thyroid, such as tiredness, unexplained weight change, a pounding heartbeat, feeling unusually cold or hot, or hair loss.
- Follow-up of thyroid treatment, so your doctor can adjust the dose.
- Before or during pregnancy, if your doctor considers it appropriate.
- As part of a routine checkup.
Preparation and fasting
A TSH test usually needs no fasting.
- If you take supplements that contain biotin (common in hair, skin and nail supplements), tell us. Biotin can affect the results of some thyroid tests.
- If you take thyroid medicine, do not stop it or change its timing on your own. Some doctors prefer the sample to be taken before that day’s dose, so ask yours.
We confirm the preparation with you on WhatsApp before your appointment.
Sample type
A blood sample from a vein, usually in your arm. Our technician takes it at your home.
About your results
Your results reach you on WhatsApp. Discuss them with the doctor who ordered the test, who can explain them in light of your health.