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Factor Xa Activity (Plasma)

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

This test measures the activity level of Factor Xa, a protein involved in blood clotting. It helps assess how well your blood is able to clot properly.

Quick summary

["This test helps evaluate your risk of bleeding or clotting disorders."]

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

Key facts at a glance

LOINC
3190-6
Short code
Fact IX Ag Act/Nor PPP IA
Synonyms
Fact IX Ag Act/Nor PPP IA
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
Method
ia
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 Is This Test Done?

Your healthcare provider may order this test if you have symptoms of blood clotting problems, such as excessive bleeding, unexplained bruising, or a history of clotting disorders. It may also be used to monitor treatment for conditions like deep vein thrombosis (DVT) or to check blood clotting function before surgery.

What Does the Test Involve?

A blood sample is taken from a vein in your arm. You may feel a small pinch when the needle is inserted, but the procedure usually takes only a few minutes. The blood sample is then sent to a lab for analysis.

What Are Common Results?

Results are typically reported as a ratio or percentage compared to a standard value. This helps determine if your blood clotting process is functioning normally or if there are abnormalities.

What Does Abnormal Result Mean?

If the results are too high, it may indicate an increased risk of blood clots. If too low, it could suggest bleeding problems or other underlying conditions affecting clotting.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Factor Xa Activity

Frequently asked questions

What does a Factor Xa Activity test measure?
This test measures how active Factor Xa is in your blood, which is part of the process that helps control bleeding by forming clots.
Can lifestyle changes affect Factor Xa levels?
While diet and exercise can influence overall blood health, they may not directly impact Factor Xa levels. However, certain medications (like blood thinners) or medical conditions can affect these levels.
How often should I get this test?
Your healthcare provider will determine the frequency based on your medical history, treatment plan, and symptoms. Regular monitoring may be needed if you are on long-term anticoagulant therapy or have a history of clotting disorders.
  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