Factor Xa Inhibitor (Antithrombin Complex) – 24-Hour Urine Collection

Why This Test Is Done

Your doctor may order this test if you have a history of bleeding disorders, clotting issues, or if you’re taking medications that affect blood clotting. It can also be used to monitor how well your body processes certain anticoagulant medications or to check for inherited clotting problems.

What to Expect Before the Test

You’ll need to collect all urine for 24 hours (typically from one morning to the next morning). Store the urine in a refrigerator and keep it cold until you return it to the lab. Follow any specific instructions your healthcare provider gives you, such as avoiding certain foods or medications that might affect the results.

What Happens During the Test

No special preparation is required beyond the 24-hour urine collection. The lab will analyze the urine sample to measure the inhibitor levels. Results are usually reported as a total amount excreted over the 24-hour period.

What the Results Mean

Results may indicate whether your body is producing enough inhibitors to control clotting, or if there’s an imbalance that could lead to bleeding or clotting problems. Your doctor will interpret the results in the context of your medical history and symptoms.