Activated Partial Thromboplastin Time - APTT/PTTK Test: Booking, Price, and Results
About Activated Partial Thromboplastin Time - APTT/PTTK Test
| Field | Value |
|---|---|
| Also Known As | APTT, PTT, partial thromboplastin time, activated PTT, PTTK, and kaolin-cephalin clotting time (KCCT) |
| Sample Type | Plasma |
| Fasting Required | No, fasting is not required. |
| Report Time | Same day |
| Recommended For | All genders and ages; particularly recommended for those with bleeding symptoms, before surgery, or on heparin therapy. |
| Price | Starting at ₹500 |
What Is an Activated Partial Thromboplastin Time - APTT/PTTK Test?
The activated partial thromboplastin time - APTT/PTTK test measures how long it takes for blood plasma to form a clot. It evaluates the intrinsic pathway of the coagulation cascade, which is the series of steps the body uses to stop bleeding. Also known as aPTT, partial thromboplastin time (PTT), or PTTK, this test helps assess the function of several clotting factors in the blood.
Doctors commonly prescribe the APTT/ PTTK test to investigate unexplained bleeding or bruising, assess clotting disorders, evaluate bleeding risk before surgery, and monitor patients receiving blood-thinning medicines such as heparin.
What Does an APTT/PTTK Test Measure?
The APTT/PTTK test evaluates several clotting factors in the blood. It focuses on the intrinsic and common pathways of clot formation. Here are the key components it assesses:
| Component | What It Measures |
|---|---|
| Clotting time (in seconds) | How long does it take for the blood to clot |
| Factor I (fibrinogen) | Whether there is enough fibrinogen to help form a blood clot |
| Factor II (prothrombin) | How well the blood can produce thrombin, which helps clotting |
| Factors V, VIII, IX, X, XI, and XII | Whether important clotting proteins are working properly |
Note: The test does not evaluate Factor VII or Factor XIII (the fibrin-stabilising factor).
Why is an APTT/PTTK Test Done?
A doctor may order an APTT/PTTK test for several reasons, ranging from investigating symptoms to monitoring ongoing treatment.
Common Symptoms That May Require This Test
- Unexplained excessive bruising
- Prolonged bleeding from minor cuts or wounds
- Frequent or unusually heavy nosebleeds
- Heavy menstrual bleeding
- Leg swelling or redness
- Chest pain linked to possible clotting concerns
Conditions This Test Can Help Detect
- Haemophilia A or B (inherited conditions with deficient clotting factors)
- Von Willebrand disease (an inherited bleeding disorder)
- Antiphospholipid syndrome (APS) and lupus-related clotting problems
- Disseminated intravascular coagulation (DIC), where clots form abnormally throughout the body
- Deep vein thrombosis (DVT) is when blood clots form in deep veins
- Coagulation factor deficiencies
- Recurrent miscarriages linked to clotting disorders
APTT/PTTK Test for Chronic Disease Monitoring
Regular APTT/PTTK monitoring is a standard part of care for patients on unfractionated heparin therapy. Because heparin has a narrow effective range, the test helps confirm the dose is working without causing excessive bleeding. Patients typically require frequent monitoring at the start of treatment, with testing becoming less frequent once their levels stabilise.
How to Prepare and What to Expect
Preparing for the APTT/PTTK test is straightforward. Here is what you need to know before your appointment.
Do You Need to Fast?
No, fasting is not required for this test. You can eat and drink normally before your sample is collected. If your doctor has ordered additional tests alongside this one, ask whether any of those require fasting.
Practical Tips Before Your Test
- Bring a detailed clinical history, including your symptoms, previous test results, and relevant medical records, as this is required for the test.
- Inform your doctor about all medications you take, particularly blood thinners such as heparin or warfarin, antihistamines, and aspirin.
- Drink adequate water before your appointment to stay well hydrated.
- Avoid strenuous physical activity immediately before sample collection.
- Wear a loose-fitting top or a garment with sleeves that can be rolled up easily.
Step-by-Step Procedure
- A trained phlebotomist will clean the inner elbow area with an antiseptic solution.
- A tourniquet may be placed around the upper arm to make the vein more visible.
- A needle is gently inserted into the vein to draw approximately 3 mL of blood.
- The blood is collected into a sky-blue tube containing sodium citrate, an anticoagulant that preserves the sample for clotting analysis.
- Once the collection is complete, the needle is removed, and gentle pressure is applied to the site, then a small bandage is applied.
- The sample is labelled and sent to the laboratory under refrigerated conditions for analysis.
Factors That Can Affect Accuracy
- Haemolysed (ruptured blood cells) or lipaemic (high-fat) samples are not suitable for testing.
- Underfilled or overfilled sample tubes can produce incorrect results.
- Medications such as heparin, antihistamines, aspirin, ascorbic acid, and chlorpromazine may prolong clotting time.
- The sample should reach the laboratory within 6 hours of collection for accurate analysis.
- Poor venepuncture technique or sample contamination can affect results.
Understanding Your APTT/PTTK Test Results
Your results show how long your plasma took to clot compared to an established normal range. A doctor should always review these values in the context of your full medical history.
| Parameter | Reference Range | Interpretation |
|---|---|---|
| aPTT (Adults) | 25 to 37 seconds | High values may indicate slower blood clotting, while low values may suggest faster-than-normal clotting. |
| aPTT (therapeutic range on heparin) | 70 to 120 seconds | Helps monitor the effectiveness and safety of heparin therapy. |
| aPTT (Pregnancy) | 24 to 30 seconds | Mild changes in clotting time may occur during pregnancy and are usually monitored clinically. |
| aPTT (full-term newborns) | Up to 35% longer than adult range | Slightly prolonged clotting times are common in newborns and usually normalize by 3 months of age. |
A high aPTT result may suggest slower blood clotting due to conditions such as liver disease, haemophilia, vitamin K deficiency, heparin therapy, or clotting factor deficiencies. A low aPTT result may indicate faster-than-normal clotting, which can occur in hypercoagulable states or increased clotting factor activity.
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
- Liver disease: Advanced liver disease often prolongs the APTT, though typically less markedly than the PT, because elevated clotting factor VIII partially offsets the deficiency.
- Pregnancy: Clotting tendencies increase as the body prepares for childbirth, so many pregnant individuals have a slightly shorter APTT than non-pregnant adults.
- Newborns: Full-term newborns may show an APTT up to 35% longer than the adult range; premature infants may show values up to twice the adult upper limit. Both typically reach adult reference ranges by 3 months of age.
- Anticoagulant medications: Heparin, fondaparinux, dabigatran, and other direct thrombin inhibitors can all prolong APTT results.
How to Maintain Healthy Levels
- Eat a balanced diet that includes vitamin K-rich foods such as leafy greens and broccoli to support clotting factor production.
- Stay well hydrated and avoid excessive alcohol intake, as alcohol can affect liver function and clotting factor synthesis.
- If you take blood-thinning medicines, attend regular monitoring appointments and follow your doctor’s instructions carefully.
Lupin Diagnostics Activated Partial Thromboplastin Time - APTT/PTTK Test Price and Home Collection
The test is available at Lupin Diagnostics starting at ₹500, with home sample collection available across multiple cities in India. The indicative city-wise prices are listed below.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 500 |
| CHENNAI | 450 |
| HYDERABAD | 500 |
| KOLKATA | 550 |
| NAVI MUMBAI | 500 |
| PUNE | 450 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps to book your test online with Lupin Diagnostics:
- 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 APTT/PTTK test home collection across cities, making it convenient to get tested without visiting a centre. All samples are processed in NABL-accredited laboratories by trained professionals. Your digital report is delivered securely via email or WhatsApp once ready.
Frequently Asked Questions
The APTT/PTTK test checks how well most of your blood clotting factors are working. Doctors use it to investigate unexplained bleeding or bruising, assess bleeding risk before surgery, diagnose conditions like haemophilia, and monitor patients on heparin therapy.
The APTT evaluates the intrinsic clotting pathway, covering most clotting factors except factor VII and factor XIII. The prothrombin time (PT) test checks a different set of factors, including Factor VII. Both tests are often ordered together for a complete picture of how well the blood is clotting.
No, fasting is not required for the APTT/PTTK test. You can eat and drink normally on the day of collection. If your doctor has ordered other tests at the same time, check whether any of those have fasting requirements.
A prolonged APTT result means your blood took longer than normal to clot. This may occur in conditions such as liver disease, haemophilia, von willebrand disease, or due to the presence of lupus anticoagulant. It can also be seen in patients receiving heparin therapy. Your doctor will interpret the result along with your symptoms, medical history, and other test findings.
Yes. Several medicines can alter clotting time, including heparin, aspirin, antihistamines, ascorbic acid, and chlorpromazine. Always give your doctor or phlebotomist a complete list of your current medications before the test, so results can be interpreted accurately.
Heparin works within a narrow effective range. Too little may not prevent dangerous clots; too much may cause serious bleeding. Regular APTT/PTTK test monitoring helps confirm that the heparin dose is achieving the desired therapeutic effect while keeping the patient safe.
Activated Partial Thromboplastin Time - APTT/PTTK Test
