APTT Test (Activated Partial Thromboplastin Time)

APTT Test: quick answers

APTT Test full form

Activated Partial Thromboplastin Time

APTT Test price

₹289, home sample collection

Normal range (adults)

Typical adult range: about 25 to 35 seconds

Done for

Unexplained bleeding or easy bruising; Before surgery or an invasive procedure; Monitoring heparin treatment given through a drip

Fasting

Not required

Report

Same day / 24 hours

What is the APTT Test?

The APTT measures how many seconds your blood plasma takes to form a clot after reagents are added in the laboratory. It checks one part of the clotting system (the intrinsic and common pathways) and is often done with the PT/INR test.

APTT Test normal range

Each laboratory sets its own APTT range for its reagent and machine, and the report usually prints a control value alongside. Compare your result with the range on your own report.

Ranges differ between laboratories and methods. The reference range printed on your own report is the one to read your result against.

What your APTT Test result means

Prolonged APTT

Can occur with heparin treatment, haemophilia A or B, von Willebrand disease, liver disease, vitamin K deficiency, disseminated intravascular coagulation or a lupus anticoagulant. A doctor may order mixing studies or factor levels to find the cause.

Short APTT

Usually not significant on its own. It can be seen when the sample was difficult to collect or in some conditions with raised clotting factors.

Normal APTT

This part of the clotting system appears to be working. It does not test platelets or every clotting factor.

One result is not a diagnosis. A doctor reads it with your symptoms, history, medicines and other tests.

Why is the APTT Test done?

• Unexplained bleeding or easy bruising
• Before surgery or an invasive procedure
• Monitoring heparin treatment given through a drip
• Investigating suspected haemophilia, von Willebrand disease or lupus anticoagulant
• Recurrent miscarriage or unexplained blood clots, as part of a wider work-up

What does the APTT Test (Activated Partial Thromboplastin Time) measure?

1 parameter. Expand a group to see the measurements, units and available method details.

The reference interval printed on your actual laboratory report governs interpretation. Intervals can vary by laboratory, method, age, sex and pregnancy. Methods can also vary by processing laboratory.

APTT Test: sample & preparation

Sample: Blood. Fasting: Not required.

• No fasting is required. Tell the lab if you are taking any blood-thinning medicine (such as heparin or warfarin), as this affects the result.

Frequently asked questions