Symptoms:

You may not have any symptoms. Symptoms that may occur include:

• Blood clots
• Recurrent miscarriages

Signs and tests:

The following tests may be done:

• Partial thromboplastin time (PTT)
• Russell viper venom time
• Thromboplastin inhibition test

Treatment:

No treatment is required if you do not have symptoms.

If you develop blood clots, your doctor may prescribe blood thinners (heparin followed by warfarin). Higher-than-usual doses of warfarin may be needed.

Expectations (prognosis):

The outcome is usually good with appropriate therapy. Some patients have difficult-to-control clots with recurrent symptoms.

Complications:

• Blood clot in lungs (pulmonary embolism)
• Heart attack
• Stroke

Calling your health care provider:

Call your health care provider if you notice symptoms of a blood clot, which include swelling or redness in the leg, shortness of breath, or pain, numbness and pallor in an arm or leg.

Prevention:

Awareness of risk factors may allow early diagnosis. Prevention may not be possible.