How do I know my heparin or warfarin therapy is working?

Periodic blood tests are necessary when you take heparin or warfarin to make sure they're working and to prevent complications of antiphospholipid syndrome. A prothrombin time (PT) test is used to calculate your International Normalized Ratio (INR), which shows if your warfarin level is in the therapeutic range. When you take heparin, a partial thromboplastin time (PTT) test can indicate if your dosage is appropriate. Your doctor may want you to have your blood tested every few weeks, but more frequent testing may be necessary early in therapy or when your dosage is changed.

Continue Learning about Anticoagulant

Why do I have to stop taking my blood thinners before knee surgery?
Dr. Rishi G. Anand, MDDr. Rishi G. Anand, MD
If you suffer from atrial fibrillation (afib) or are taking blood thinners (anticoagulants), you wil...
More Answers
What drugs may interact with anticoagulants?
Donna Hill Howes, RNDonna Hill Howes, RN
The following drugs may interact with anticoagulant drugs, leading to side effects: antiplatelet ...
More Answers
What are some examples of commonly prescribed anticoagulant medicines?
Some common anticoagulant medications include:•Warfarin (Coumadin) •Heparin•Lovenox•Bivalrudin
More Answers
How are anticoagulants used?
Anticoagulants are medications that inhibit blood clotting. While they cannot dissolve an existing c...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.