Factor XII Functional Test: Booking, Price, and Results
About Factor XII Functional Test
| Field | Value |
|---|---|
| Also Known As | Factor XII Activity Test, Hageman Factor Assay, Coagulation Factor XII Activity Test |
| Sample Type | Venous blood |
| Fasting Required | No fasting required |
| Report Time | 24 hours |
| Recommended For | All genders and ages; particularly those with unexplained prolonged aPTT |
| Price | Starting at ₹3,584 |
What Is a Factor XII Functional Test?
The factor XII functional test measures the activity of factor XII, a protein in the blood that plays a role in the body's clotting process. Doctors typically order it when routine clotting tests show an unexplained result or when a patient has a family history of factor XII deficiency. It is also called the Hageman factor assay, coagulation factor XII activity test, or factor XII activity test. A venous blood sample is used for this test.
What Does a Factor XII Functional Test Measure?
The factor XII functional test checks how well factor XII is functioning in your blood. Factor XII, also known as the Hageman factor, is produced in the liver and is part of the contact activation pathway, which helps trigger the clotting process.
The table below explains what the test looks at:
| Parameter | What It Tells You |
|---|---|
| Factor XII Activity | The percentage of Factor XII activity in your blood compared to a standard laboratory control, indicating whether the protein is working at normal levels |
Why Is a Factor XII Functional Test Done?
A doctor may order the factor XII functional test for several reasons, from investigating an unusual clotting test result to assessing for a rare inherited condition.
Common Symptoms That May Require This Test
Factor XII deficiency often causes no symptoms at all. The test is usually triggered by abnormal findings in other blood tests rather than physical complaints. However, some situations that lead to testing include:
- Unexplained prolonged aPTT (activated partial thromboplastin time, a routine clotting test) found during screening
- Abnormal clotting results before a planned surgery
- Family history of factor XII deficiency or clotting disorders
- Recurrent pregnancy loss being investigated for an underlying cause
- Suspected liver disease affecting clotting protein production
- Signs of sepsis or critical illness where clotting function is being assessed
- Evaluation to differentiate factor XII deficiency from antiphospholipid syndrome
Conditions This Test Can Help Detect
The factor XII activity test can help identify several conditions. These include:
- Factor XII deficiency, a rare inherited disorder where the protein is absent or very low
- Liver disease, which reduces the liver's ability to produce clotting proteins including factor XII
- Sepsis, where critically ill patients frequently show reduced factor XII levels
- Disseminated intravascular coagulation (DIC), a serious condition involving abnormal clotting throughout the body
- Venous thrombosis, which may be associated with elevated factor XII levels in some cases
- Antiphospholipid syndrome evaluation, where factor XII testing helps distinguish between conditions
How to Prepare and What to Expect
Preparation for this test is straightforward, but there are some important steps to follow to ensure accurate results.
Do You Need to Fast?
No, fasting is not required before a factor XII functional test. You can eat and drink as normal before the sample is collected. However, always follow any specific instructions provided by your doctor.
Practical Tips Before Your Test
A few simple steps will help ensure the sample is suitable for testing:
- Inform your doctor about all medications you are currently taking, especially anticoagulants such as warfarin, heparin, or direct thrombin inhibitors
- If possible, avoid warfarin for at least two weeks and heparin or similar therapies for approximately three days before the test, only after confirming this with your doctor
- Also mention any hormonal medications or steroids you are using
- Stay well hydrated to make the blood draw easier
- Wear a loose-sleeved top so the phlebotomist can access your arm easily
- Do not have blood drawn from an arm with a heparin lock or heparinised catheter
Step-by-Step Procedure
The collection process is quick and straightforward. Here is what typically happens:
- A trained phlebotomist cleans a small area on your inner arm and inserts a fine needle into a vein to draw blood.
- The blood is collected into a specific blue-top tube containing a citrate solution that prevents premature clotting.
- The tube is gently inverted several times to mix the blood with the solution evenly.
- The sample is labelled with your details and sent promptly to the laboratory.
- In the laboratory, the sample is spun in a centrifuge to separate the plasma from the blood cells, and the plasma is frozen quickly to preserve its quality.
- Your report is prepared and delivered within the stated turnaround time.
Factors That Can Affect Accuracy
Several factors can influence coagulation factor XII activity test results. These include:
- Anticoagulant medications (warfarin, heparin) taken before the test
- Blood tube not filled to the correct level, altering the blood-to-anticoagulant ratio
- Sample haemolysis (breakdown of red blood cells during or after collection)
- Clotted or improperly stored specimens
- Using glass rather than plastic collection vials, which can activate the sample
- Very high haematocrit (the proportion of red blood cells in blood), which may require tube adjustment
Understanding Your Factor XII Functional Test Results
Your results will show the activity level of factor XII as a percentage relative to a standard control. A qualified doctor should always review these alongside your full medical history. The table below gives a general guide to reference ranges:
| Parameter | Normal Range | Low May Indicate | High May Indicate |
|---|---|---|---|
| Factor XII Activity | 50% to 150% of normal clotting time (in seconds) | Congenital deficiency, liver disease, sepsis | Venous thrombosis risk, acute inflammatory response |
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 influence how results are interpreted:
Newborns and young infants naturally have lower factor XII activity. Their levels may remain below adult ranges for six months or more after birth, and this is considered normal for their age group.
Patients with liver disease often show reduced factor XII levels, since the liver is responsible for producing this protein. In sepsis or critical illness, low factor XII is frequently observed and is a known finding rather than an isolated concern.
Factor XII can also be affected by conditions such as coronary artery disease, inflammatory bowel disease, pharmacological thrombolysis (clot-dissolving treatment), and septicaemia. These should be considered when reviewing results.
How to Maintain Healthy Levels
General lifestyle habits that support liver and cardiovascular health may also support normal clotting protein production:
- Eat a balanced diet rich in vegetables, wholegrains, and lean proteins, and limit alcohol intake to protect liver function
- Keep chronic conditions such as infections, inflammatory conditions, or metabolic disorders well managed with regular medical follow-up
- If you have a family history of clotting disorders, discuss routine health screening with your doctor
Lupin Diagnostics Factor XII Functional Test Price and Home Collection
The factor XII functional test price starts at approximately ₹3,584. Home sample collection is available, allowing you to get tested from the comfort of your home. The table below shows indicative prices across major cities in India:
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹3,584 |
| Bengaluru | ₹3,584 |
| Hyderabad | ₹3,584 |
| Chennai | ₹3,584 |
| Kolkata | ₹3,584 |
| Pune | ₹3,584 |
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 collection for the Hageman factor assay across cities in India, with samples collected by trained, certified phlebotomists. All samples are processed in NABL-accredited laboratories to ensure quality and accuracy. Your digital report is delivered directly to your email or WhatsApp once ready.
Frequently Asked Questions
The factor XII functional test is used to measure the activity of factor XII, a clotting protein also called the Hageman factor. It is most commonly ordered when a routine clotting test called aPTT returns a prolonged result without a clear explanation. It also helps confirm or rule out factor XII deficiency and investigate related conditions.
No. Unlike deficiencies in many other clotting factors, factor XII deficiency does not cause a bleeding tendency. People with this condition do not experience excessive bleeding, even after surgery or injury. The abnormal result on a clotting test is a laboratory finding and does not indicate a clinical bleeding risk.
When factor XII is absent or very low, it causes a significant prolongation of the aPTT, which is the activated partial thromboplastin time. This can look similar to a bleeding disorder on paper. However, it does not reflect an actual risk of bleeding in the patient, which is why further testing such as the factor XII functional test is done to investigate the cause.
Some case reports and studies suggest that factor XII deficiency may be associated with an increased tendency to form blood clots (thrombi) in some individuals. High factor XII activity levels have also been linked to venous thrombosis in certain cases. Your doctor will review your complete history to assess this risk.
Factor XII deficiency is a congenital condition, meaning it is present from birth. It is most commonly inherited in an autosomal recessive pattern, meaning a child would need to inherit a faulty gene from both parents. In some cases, autosomal dominant inheritance has also been reported.
You should inform your doctor about all medications before the test. Anticoagulants such as warfarin and heparin can affect results. Your doctor may advise pausing certain medications before sample collection. Never stop any medication on your own without medical guidance.
Factor XII Functional Test: Booking, Price, and Results
