Factor X Assay: Booking, Price, and Results
About Factor X Assay: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Stuart-Prower factor assay, Stuart factor assay, Coagulation factor X activity test |
| Sample Type | Venous blood |
| Fasting Required | Not required |
| Report Time | Same day |
| Recommended For | All genders and ages, particularly those with unexplained bleeding symptoms |
| Price | Starting at ₹7,000 |
What Is a Factor X Assay?
A factor X assay is a blood test that measures how much active factor X is in your blood. Factor X is a protein made in the liver that plays a key role in forming blood clots. Doctors order this test when a patient has unexplained bleeding or abnormal results on routine clotting tests. This test is also known as the Stuart-Prower factor assay, Stuart factor assay or coagulation factor X activity test. A small sample of venous blood is drawn and processed as citrated plasma for analysis.
What Does a Factor X Assay Measure?
The coagulation factor X activity test evaluates how well factor X is functioning in your blood. Factor X is a vitamin K-dependent enzyme produced by the liver, with a half-life of 24 to 48 hours. It acts at the junction of both major clotting pathways (intrinsic and extrinsic) to help convert prothrombin into thrombin, a key step in clot formation.
The test reports a single parameter:
| Parameter | What It Shows |
|---|---|
| Factor X activity | The percentage of factor X activity compared with a normal reference value indicates whether the clotting function at this step is adequate |
Why Is a Factor X Assay Done?
A doctor may order this test for several reasons, from investigating a bleeding symptom to checking a known condition.
Common Symptoms That May Require This Test
The following symptoms may prompt a doctor to request a factor X assay:
- Frequent or prolonged nosebleeds
- Easy or unexplained bruising
- Bleeding under the skin
- Bleeding of the gums
- Blood in the urine (haematuria)
- Excessive bleeding after surgery or an injury
Conditions This Test Can Help Detect
The factor X assay can assist in identifying or evaluating a range of conditions, including:
- Congenital (inherited) factor X deficiency, a rare bleeding disorder present from birth
- Acquired factor X deficiency linked to liver disease, vitamin K deficiency, or warfarin therapy
- Systemic amyloidosis, a condition in which abnormal proteins build up in organs and can deplete factor X
- Disseminated intravascular coagulation (DIC), a serious condition involving widespread clotting activity
- Prolonged prothrombin time (PT) or activated partial thromboplastin time (aPTT), two routine clotting tests that may need further investigation
How to Prepare and What to Expect
Preparation for this test is straightforward, but a few steps will help ensure an accurate result.
Do You Need to Fast?
Fasting is not required for the factor X assay. However, if your doctor has requested additional tests at the same time, check whether those tests have their own fasting requirements. Always follow specific instructions provided by your doctor or the laboratory.
Practical Tips Before Your Test
A few simple steps before your appointment can help with a smooth sample collection:
- Inform your doctor about all medications you are taking, particularly blood thinners such as warfarin
- Stay well hydrated before your appointment
- Avoid strenuous physical activity in the hours before the test
- Wear clothing with loose or short sleeves for easy access to your arm
Step-by-Step Procedure
Here is what happens during a typical factor X assay sample collection:
- The phlebotomist cleans the inside of your arm with an antiseptic wipe to prepare the site for sample collection.
- A soft elastic band is placed around your upper arm to help make the vein easier to locate.
- A small sterile needle is inserted into a vein in your arm or hand to collect the blood sample for the factor X assay.
- The blood sample is collected into a properly labelled tube.
- Once the sample has been obtained, the elastic band is removed, and gentle pressure is applied to the puncture site.
- A small bandage is placed over the site, and the sample is sent to the laboratory for analysis.
Factors That Can Affect Accuracy
Certain factors may influence how reliable your Stuart factor assay results are:
- Use of anticoagulant medicines such as warfarin, rivaroxaban, apixaban, dabigatran, or edoxaban
- A specimen that is haemolysed (where red blood cells are damaged) or one that has clotted
- An incompletely filled collection tube, which changes the blood-to-solution ratio
- A sample tested more than 2 hours after collection without proper storage
- Platelet contamination if the sample is not properly centrifuged
Understanding Your Factor X Assay Results
Your results should always be reviewed with your doctor, who will consider them alongside your symptoms, medical history, and other test findings. The table below provides a general guide:
| Range (Factor X) | Interpretation |
|---|---|
| 45% to 155% | Normal range |
| 10% to 40% | Mild factor X deficiency (symptoms may appear) |
| 1% to 10% | Severe factor X deficiency |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain circumstances can shift factor X levels away from the typical adult range:
- Newborns and young infants may have lower factor X activity than adults, and levels may not reach adult values until several months after birth.
- Patients with significant liver disease or vitamin K deficiency often exhibit reduced factor X activity, as both are required for its production.
- Patients on oral anticoagulant therapy (such as warfarin) will have intentionally lowered factor X levels. In those with a lupus anticoagulant (antibodies that interfere with standard clotting tests), the factor X level is sometimes used as an alternative means of monitoring therapy.
How to Maintain Healthy Levels
These general wellness habits support healthy clotting factor production:
- Eat a balanced diet that includes vitamin K-rich foods such as green leafy vegetables and broccoli
- Limit alcohol consumption, as excessive intake can impair liver function and reduce clotting factor production
- Always discuss any new medicines or supplements with your doctor, as several can interfere with clotting factors
Lupin Diagnostics Factor X Assay Price and Home Collection
The factor X assay price at Lupin Diagnostics starts at approximately ₹7,000, and home sample collection is available across cities in India. This table shows indicative prices:
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹7,000 |
| Bengaluru | ₹7,000 |
| Chennai | ₹7,000 |
| Hyderabad | ₹7,000 |
| Kolkata | ₹7,000 |
| Pune | ₹7,000 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Home collection for the factor X assay is available across multiple cities. A certified phlebotomist visits your location to collect the blood sample, which is then transported under strictly controlled conditions to ensure accuracy. All samples are processed in NABL-accredited laboratories, and reports are delivered digitally for easy access and sharing with your doctor.
Frequently Asked Questions
The Stuart-Prower factor is another name for factor X, a protein produced by the liver that plays a critical role in the blood clotting process. It helps convert prothrombin to thrombin, which is needed to form a stable clot. Without adequate factor X activity, even minor injuries can lead to prolonged bleeding.
This test is relevant for people with unexplained or excessive bleeding, those with prolonged results on routine clotting tests (PT or aPTT), and patients being assessed for inherited or acquired bleeding disorders. Your doctor will advise whether this test is appropriate for your situation.
Fasting is not required for the factor X assay. However, if your doctor has requested additional tests at the same time, check whether those tests have their own fasting requirements. Always follow specific instructions provided by your doctor or the laboratory.
Yes. Warfarin and similar anticoagulant medications are known to reduce factor X activity as part of their intended effect. Certain newer oral anticoagulants such as rivaroxaban and apixaban may also interfere with the testing method. Always give your doctor a full list of your current medications before the test.
Inherited Factor X deficiency is caused by a genetic change present from birth and is very rare. An acquired deficiency develops during a person's lifetime, usually as a result of liver disease, vitamin K deficiency, warfarin therapy, or systemic amyloidosis. Acquired deficiency is more frequently seen than the inherited form.
Reports are typically available within the same day of sample collection. Lupin Diagnostics delivers reports digitally via email or WhatsApp once ready.
Factor X Assay: Booking, Price, and Results
