Find the right blood test for you.

Measures prothrombin time and reports it as an INR, a standardized value. Used to monitor warfarin treatment and to assess clotting and liver function. View details →

Counts reticulocytes, the newly made red blood cells. Shows whether the bone marrow is responding to anemia by producing more cells, or failing to. View details →

Measures antibodies to Sm and Sm/RNP antigens. Anti-Sm is highly specific to lupus, while Sm/RNP antibodies appear in lupus and mixed connective tissue disease. View details →

Measures total thyroxine (T4), the main hormone produced by the thyroid gland, together with the Free T4 Index. Can help assess how the thyroid is functioning. View details →

Measures total testosterone and the free portion available to tissues, using mass spectrometry. More informative than a total alone when binding proteins are unusual. View details →

Measures thyroglobulin together with thyroglobulin antibodies. Used mainly to monitor people treated for thyroid cancer, where the antibody result affects interpretation. View details →

Measures vitamin E, reporting alpha-tocopherol and beta-gamma tocopherol separately. Vitamin E is a fat-soluble antioxidant that protects cell membranes. View details →

Measures 17-hydroxyprogesterone, a steroid the adrenal glands produce on the way to making cortisol. Can help assess congenital adrenal hyperplasia and some causes of excess androgens. View details →

Measures ACTH, the pituitary hormone that tells the adrenal glands to make cortisol. Usually measured alongside cortisol to help work out where an adrenal problem is coming from. View details →

Measures IgE antibodies to alpha-gal, a sugar found in red meat. Can help assess alpha-gal syndrome, a delayed allergic reaction to mammal meat that usually follows a tick bite. View details →

Measures aluminum in the blood. Most relevant for people with reduced kidney function or on long-term dialysis, where aluminum can build up rather than being cleared. View details →

Measures ammonia in the blood. Ammonia is a waste product the liver normally converts to urea, and raised levels can accompany serious liver disease or certain inherited disorders. View details →