A normal PT test result typically ranges from 11 to 13.5 seconds. However, this can vary depending on the laboratory and the reagents used. An INR value of 0.8 to 1.1 is considered normal. Abnormal results may indicate:
- Prolonged PT: This can be due to liver disease, vitamin K deficiency, or the presence of inhibitors such as lupus anticoagulant. It can also occur in patients on anticoagulant therapy. - Shortened PT: Less common and usually of less clinical significance, a shortened PT may indicate a high risk of clotting disorders.
