Which laboratory test measures the effectiveness of heparin therapy?

Partial Thromboplastin Time (PTT) is used to monitor clients who are receiving heparin. PTT is the time it takes for a clot to form, measured in seconds. Normally, the sample will clot in 35 seconds. Clients on anticoagulant therapy will be in a reference range that is 1.5-2.5 times the control, about 60-70 seconds.

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