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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.

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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.