You don't need to fast. To check before coming in, call 8872524007.
What the APTT test checks
APTT covers the "intrinsic" and common pathways: factors XII, XI, IX and VIII, plus X, V, II and fibrinogen. A shortage of any of these, or something in the blood that blocks them, makes the time longer.
Results are given in seconds and shown next to a normal control run on the same day. Some reports also give a ratio of patient time to control time.
Why your doctor may order it
- before surgery, a tooth extraction, or procedures like a biopsy
- unexplained bleeding, heavy periods, large bruises or bleeding into joints
- a family history of haemophilia or von Willebrand disease
- monitoring unfractionated heparin, usually in hospital
- repeated miscarriages or clots, where doctors look for a lupus anticoagulant
That last point surprises people. A lupus anticoagulant makes APTT longer in the tube, yet in the body it is linked to a higher risk of clots, not bleeding. Doctors follow up a long APTT with a mixing study and other tests to tell these apart.
How to prepare
No fasting is needed. Tell us if you take heparin, enoxaparin, warfarin, Acitrom, dabigatran or rivaroxaban, because each can affect the result. Don't stop any medicine for the test unless your doctor tells you to.
Sample type and report time
The sample goes into a light-blue citrate tube that must be filled exactly to the mark. APTT is more time-sensitive than PT: the plasma should be tested within about four hours of collection. That makes walk-in at the lab the easiest option, though early home collection in Banur can work if we plan it. Blood drawn through a line that has carried heparin can give a falsely long time, so in a clinic setting a fresh vein is preferred. Report: usually the same day for samples in by 11 am.
Understanding your results
APTT ranges depend heavily on the reagent used. Many labs report roughly 25–40 seconds as normal, but the range printed on your report is the one that applies.
A prolonged APTT can be associated with heparin, haemophilia A or B, von Willebrand disease, liver disease, vitamin K deficiency, a lupus anticoagulant or, rarely, factor XII deficiency (which doesn't usually cause bleeding). A short APTT is less commonly significant. Your doctor reads the result alongside your symptoms and other tests, including PT and a platelet count.
FAQ
What is the difference between PT and APTT?
They test different arms of the clotting system. PT is used for warfarin; APTT is used for heparin and to screen for haemophilia-type problems.
Why did my APTT need repeating?
Under-filled tubes, a delay before testing or a clotted sample all make the result unreliable. A repeat is the only safe fix.
Is there an APTT test near me in Banur?
Yes. For an APTT test near me in Banur, Alpha Laboratory collects the sample at the lab on M.C. Road from 7 am.
Can APTT detect haemophilia?
A long APTT can suggest it. Confirming haemophilia needs specific factor assays at a specialist centre.
Book at Alpha Laboratory
For an APTT test before surgery, bring the surgeon's slip and your list of medicines. Call 8872524007, WhatsApp us, or leave your details on the contact page.