Antithrombin III

Alternative names:

A-Th3; AT III

Normal values:

The normal range is 0.20 to 0.45 mg/ml (or more than 50% of the laboratory control value).

Note: mg/ml = milligrams per milliliter

What abnormal results mean:

Reduced levels (a deficiency) indicate an increased risk of clotting. Examples of disorders and/or conditions associated with increased blood clotting include:

• deep venous thrombosis
• pulmonary embolus
• phlebitis (vein inflammation)

Other conditions that can be related to deficient AT III include:

• DIC (disseminated intravascular coagulation)
• other coagulation disorders
• liver disorders

Elevated levels of Antithrombin III may indicate:

• recent kidney transplant
• use of oral anticoagulant medications
• use of anabolic steroids