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Factor Xa Inhibitor Activity in Plasma (24-Hour Profile)

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of Factor Xa inhibitors in your blood plasma over a 24-hour period, which helps assess anticoagulant activity from medications like direct oral anticoagulants (DOACs).

Quick summary

["This test helps monitor how your body processes certain blood-thinning drugs."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
109620-5
Short code
Fact X Inhib Msmt PPP
Synonyms
Fact X Inhib Msmt PPP
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you’re taking medications like apixaban, rivaroxaban, or edoxaban, which affect blood clotting. It’s also used to evaluate bleeding risks or guide dosage adjustments in patients with kidney issues or other conditions requiring anticoagulation monitoring.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw. Wear a comfortable shirt for easy access to your arm. Bring any medications or supplements you’re taking to discuss with your provider.

During the Test

A healthcare professional will insert a needle into a vein in your arm to draw blood. The process usually takes a few minutes. You may feel a brief pinch, but it’s quick. The blood sample is then sent to a lab for analysis.

What the Results Mean

Results show the presence and activity of Factor Xa inhibitors, which help determine if your medication is working as intended. Abnormal levels may indicate issues like poor absorption, drug interactions, or kidney problems affecting metabolism.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Factor Xa Inhibitor Screening

Frequently asked questions

How long does it take to get my test results?
Results are typically available within 1–3 business days, depending on lab processing times. Your healthcare provider will contact you once they’re ready to discuss the findings.
Can I eat or drink before the blood draw?
Yes, you can eat and drink normally, but avoid heavy meals or alcohol 8–12 hours before your appointment. Fasting is only required if your provider specifies it for other tests.
Will I need to take any special precautions while on this medication?
Yes, follow your provider’s instructions carefully. Avoid activities that increase bleeding risk (e.g., vigorous exercise, contact sports). Report any unusual bleeding, bruising, or signs of internal bleeding (e.g., severe pain, black stools) immediately.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy