Factor IX Functional Test: Booking, Price, and Results
About Factor IX Functional Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Factor IX Activity Assay, FIX Assay, Christmas Disease Test, Haemophilic Factor B, Serum Factor IX, Plasma Thromboplastin Component (PTC) |
| Sample Type | Venous blood (citrated plasma) |
| Fasting Required | No |
| Report Time | 24 to 48 hours |
| Recommended For | All genders and ages; primarily males due to X-linked inheritance pattern |
| Price | Starting at ₹1,000 |
What Is a Factor IX Functional Test?
The Factor IX Functional Test measures the activity of Factor IX, a protein in the blood that plays a key role in clotting.
It is most often ordered when a doctor suspects a bleeding disorder, or when a patient has a family history of haemophilia B. Also called the Christmas Disease Test or Factor IX Activity Assay, this test uses a blood sample drawn from a vein.
The result helps doctors understand whether your blood can clot normally.
What Does a Factor IX Functional Test Measure?
The test measures how active Factor IX is in your blood.
Factor IX is a vitamin K-dependent protein made in the liver.
It works within the intrinsic coagulation pathway, the body's internal clotting cascade, to activate Factor X alongside Factor VIII, ultimately forming a blood clot.
The table below shows the parameters measured:
| Parameter | What It Tells Us |
|---|---|
| Factor IX Activity (Adults) | Whether Factor IX is functioning within the normal range |
| Factor IX Activity (Infants up to 6 months) | Whether lower values are age-appropriate or clinically significant |
Why Is a Factor IX Functional Test Done?
Doctors order this test to investigate unusual bleeding, confirm a diagnosis, or track how well treatment is working.
The sections below explain the most common reasons in more detail.
Common Symptoms That May Require This Test
The following symptoms are among the most common reasons a doctor may request a Factor IX Assay:
- Mouth bleeds (e.g. from gums during dental treatment)
- Unexplained or excessive bruising
- Blood in urine or stool
- Spontaneous bleeding into joints (haemarthrosis)
- Frequent or heavy nosebleeds
- Bleeding into muscles (e.g. under the skin)
- Heavy menstrual bleeding in female carriers
- Bleeding from mucous membranes (e.g. inside the gastrointestinal tract)
Conditions This Test Can Help Detect
A Serum Factor IX or Haemophilic Factor B test can help identify the following conditions:
- Haemophilia B (congenital Factor IX deficiency, inherited as an X-linked recessive disorder)
- Acquired Factor IX deficiency linked to liver disease or vitamin K deficiency
- Deficiency caused by warfarin therapy or the presence of inhibitors
- Prolonged activated partial thromboplastin time (aPTT) of unclear cause
- Combined deficiency of vitamin K-dependent clotting factors
Factor IX Functional Test for Chronic Disease Monitoring
For patients already diagnosed with haemophilia B, the Factor IX Activity Assay is an important tool for monitoring treatment.
Regular testing helps doctors confirm that Factor IX replacement therapy is maintaining adequate levels to prevent bleeding episodes.
The frequency of monitoring is determined by the treating haematologist based on the patient's treatment regimen and clinical needs.
How to Prepare and What to Expect
Preparation for this test is straightforward. The points below cover everything you need to know before your appointment.
Do You Need to Fast?
No fasting is required for this test. You can eat and drink normally before your sample is collected.
However, if your doctor has ordered other tests alongside this one, some of those may require fasting.
Check with your doctor or the laboratory in advance.
Practical Tips Before Your Test
Here are a few things to keep in mind before your appointment:
- Tell your doctor if you are taking warfarin, heparin, or any other blood-thinning medication
- Mention any supplements or herbal remedies you take regularly
- Inform the laboratory if you have received a blood transfusion in the last 48 hours, as this can affect results
- Share any family history of bleeding disorders with your doctor
- Wear a short-sleeved or loose-sleeved top for easy access to the arm
Step-by-Step Procedure
The sample collection process is quick and straightforward. Here is what typically happens:
- A trained phlebotomist (blood collection specialist) cleans the skin on your inner arm and locates a suitable vein.
- A small needle is used to draw blood into a specialised light blue tube containing sodium citrate, which prevents the blood from clotting prematurely.
- The tube is gently inverted several times to mix the blood with the preservative.
- The sample is centrifuged (spun at high speed) within four hours to separate the plasma from the blood cells.
- The plasma is frozen promptly to preserve its clotting activity for accurate analysis.
- The sample is dispatched to the laboratory, where the test is carried out using the activated partial thromboplastin time (aPTT) method.
Factors That Can Affect Accuracy
Several factors can influence the reliability of your results:
- Warfarin or heparin use at the time of testing
- A blood transfusion within the preceding 48 hours
- Haemolysis (breakdown of red blood cells in the sample)
- High fat content in the blood sample (lipaemia)
- Improper sample handling or delays in processing
Understanding Your Factor IX Functional Test Results
Results from this test need to be reviewed in the context of your full medical history.
The table below provides general reference ranges.
| Parameter | Normal Range | Low (Possible Concern) | High (Possible Concern) |
|---|---|---|---|
| Factor IX Activity (Adults) | 50% to 150% of normal | Below 40% to 50% | Above 150% |
| Factor IX Activity (Infants up to 6 months) | Approximately 20 IU/dL or below may be normal | Interpreted with age in mind | Interpreted with age in mind |
Haemophilia B severity is classified as follows:
| Severity | Factor IX Level |
|---|---|
| Mild | Greater than 5% to less than 40% of normal |
| Moderate | 1% to 5% of normal |
| Severe | Less than 1% of normal |
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 health states and medications can shift Factor IX levels away from the standard reference range:
- Oral contraceptive use, certain hormonal therapies, obesity, inflammatory conditions, and advancing age may raise Factor IX levels.
- Elevated levels have been associated with a higher risk of thrombosis (blood clot formation).
- Liver disease, vitamin K deficiency, and warfarin therapy tend to lower Factor IX levels, because the liver produces Factor IX, and vitamin K is needed to activate it.
- Infants aged six months or younger naturally have lower Factor IX levels.
- Values around 20 IU/dL or below may be entirely normal in this age group.
How to Maintain Healthy Levels
These general tips support liver and clotting health:
- Eat a balanced diet that includes leafy green vegetables, which are a good source of vitamin K.
- Limit alcohol consumption to protect liver function, as the liver produces Factor IX.
- Report any unusual or unexplained bleeding or bruising to your doctor without delay.
Lupin Diagnostics Factor IX Functional Test Price and Home Collection
The Factor IX Functional Test is available at Lupin Diagnostics with home sample collection across cities.
Indicative pricing based on aggregator data is provided below.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹1,000 |
| Kolkata | ₹1,000 |
| Bangalore | ₹1,000 |
| Chennai | ₹1,000 |
| Guwahati | ₹1,000 |
| Hyderabad | ₹1,000 |
| Pune | ₹1,000 |
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
Lupin Diagnostics offers home sample collection for this test across multiple cities.
All samples are processed in NABL-accredited laboratories, ensuring reliable and accurate results.
Your digital report is delivered directly to your email or WhatsApp for easy access.
Frequently Asked Questions
This test is used to find the cause of abnormal or excessive bleeding. It is commonly ordered when haemophilia B is suspected, when a family member has been diagnosed with the condition, or when a routine clotting test (aPTT) has come back abnormal. It also helps monitor how well Factor IX replacement therapy is working.
This test is most relevant for males with unexplained bleeding symptoms, individuals with a family history of haemophilia B, patients with a prolonged aPTT result, and anyone already on Factor IX replacement therapy who needs regular monitoring of their treatment response.
Yes. Haemophilia B was historically called Christmas disease, named after Stephen Christmas, the first patient ever diagnosed with the condition. The Christmas Disease Test is simply another name for the Factor IX Activity Assay, which measures Factor IX activity in the blood.
Haemophilia B follows an X-linked recessive inheritance pattern. The gene responsible (F9) sits on the X chromosome. Males carry one X chromosome, so a single faulty copy of the gene is enough to cause the condition. Females carry two X chromosomes, so one working copy usually prevents the full disorder, although they may still be carriers.
Women are most often carriers rather than affected individuals. Carrier females may experience mildly low Factor IX levels and symptoms such as heavy periods, but these are usually not severe. In rare cases, a woman who inherits two defective copies of the F9 gene can have haemophilia B.
Anticoagulant medications such as warfarin and heparin can significantly lower apparent Factor IX activity and reduce test accuracy. If you are on these medications, inform your doctor before the test so the result can be interpreted appropriately.
The frequency of monitoring depends on the individual's treatment regimen and is decided by the treating haematologist. During clinical treatment programmes, Factor IX levels have been measured as often as every four weeks. Your doctor will advise you on the schedule that suits your specific situation.
Factor IX Functional Test: Booking, Price, and Results
