Longevity

Transferrin Saturation Blood Test: Normal Range...

What Is Transferrin Saturation? Transferrin saturation (TSAT) is a calculated percentage representing how much of the body's iron-transport protein (transferrin) is currently carrying iron. It is calculated as: TSAT =...

Transferrin Blood Test: Normal Ranges, Causes &...

What Is Transferrin? Transferrin is a glycoprotein produced by the liver that serves as the primary iron transport vehicle in the blood. Each transferrin molecule can bind two iron atoms,...

Tissue Transglutaminase IgA (tTG) Blood Test: N...

What Is Tissue Transglutaminase IgA? Tissue transglutaminase IgA (tTG-IgA) is an antibody directed against the enzyme tissue transglutaminase (tTG) - an enzyme found in the intestinal wall that plays a...

Free T4 (Thyroxine) Blood Test: Normal Ranges, ...

What Is Free T4? Free thyroxine (FT4) measures the unbound, biologically active fraction of thyroxine in the blood. Thyroxine is the most abundant thyroid hormone, produced exclusively by the thyroid...

TSH Blood Test: Normal Ranges, Causes & What Yo...

What Is TSH? Thyroid stimulating hormone (TSH), also known as thyrotropin, is produced by the anterior pituitary gland and acts as the master regulator of thyroid function. TSH stimulates the...

Thyroid Peroxidase Antibody (TPO) Blood Test: N...

What Is Thyroid Peroxidase Antibody? Thyroid peroxidase antibodies (TPO Ab, also called anti-TPO or thyroid microsomal antibodies) are autoantibodies directed against thyroid peroxidase - the key enzyme responsible for iodinating...