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The partial thromboplastin time (PTT), also known as the activated partial thromboplastin time (aPTT or APTT), is a blood test that characterizes coagulation of the blood.A historical name for this measure is the Kaolin-cephalin clotting time (KCCT), [1] reflecting kaolin and cephalin as materials historically used in the test.
Fresh normal plasma has all the blood coagulation factors with normal levels. If the problem is a simple factor deficiency, mixing the patient plasma 1:1 with plasma that contains 100% of the normal factor level results in a level ≥50% in the mixture (say the patient has an activity of 0%; the average of 100% + 0% = 50%). [3]
Clotting time is a general term for the time required for a sample of blood to form a clot, or, in medical terms, coagulate. The term "clotting time" is often used when referring to tests such as the prothrombin time (PT) , activated partial thromboplastin time (aPTT or PTT), activated clotting time (ACT), thrombin time (TT), or Reptilase time .
Batroxobin has a similar action to thrombin but unlike thrombin it is not inhibited by heparin, so reptilase time and thrombin time can be used concurrently to distinguish anticoagulant effect from hypofibrinogenemia or dysfibrinogenemia. [1] [5] Normal values for thrombin time may be 12 to 14 seconds, [6] but the test has significant reagent ...
The basic screen consists of: platelet count; bleeding time for platelet function; PR (prothrombin ratio) for the tissue factor pathway (extrinsic pathway) aPTT (Activated Partial Thromboplastin time) for the contact activation pathway (intrinsic pathway) TCT or fibrinogen assay for final common pathway (THROMBIN TIME)
The quantitative and qualitative screening of fibrinogen is measured by the thrombin clotting time (TCT). Measurement of the exact amount of fibrinogen present in the blood is generally done using the Clauss fibrinogen assay. [48] Many analysers are capable of measuring a "derived fibrinogen" level from the graph of the Prothrombin time clot.
The calibrated automated thrombogram (CAT or CT) is a thrombin generation assay (TGA) and global coagulation assay (GCA) which can be used as a coagulation test to assess thrombotic risk. [1] [2] It is the most widely used TGA. [3] The CAT is a semi-automated test performed in a 96-well plate and requires specialized technologists to be ...
Activated partial thromboplastin time (APTT or aPTT) Characteristics of the velocity of passage of the intrinsic coagulation pathway; Poor plasma (the most convenient to work with, but no realization of the thrombocyte clotting mechanism) Contact activation pathway