aPTT


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time

 [tīm]
a measure of duration. See under adjectives for specific times, such as bleeding time.
activated partial thromboplastin time (APTT, aPTT) the period required for clot formation in recalcified blood plasma after contact activation and the addition of platelet substitutes such as brain cephalins or similar phospholipids; used to assess the coagulation pathways. A prolonged aPTT can indicate a deficiency of any of various coagulation factors, including factors XII, XI, IX, VIII, X, V, and II, and fibrinogen.
AEC minimal response time the shortest duration at which x-ray exposure can be terminated by automatic exposure control.
atrioventricular sequential time a fixed nonprogrammable interval that extends from the atrial stimulus to the ventricular stimulus.
bleeding time the time required for a standardized wound to stop bleeding; used as a test for platelet disorders; see also bleeding time.
circulation time the time required for blood to flow between two given points; see also circulation time.
clotting time (coagulation time) the time required for blood to clot in a glass tube; see also clotting.
cold ischemia time the time between the placement of a traumatically amputated body part in ice and the time of surgical replantation.
inertia time the time required to overcome the inertia of a muscle after reception of a stimulus.
ischemia time the total time between traumatic amputation of a limb or portion of a limb and its surgical reimplantation; it is the sum of warm and cold ischemia times.
minimal response time in radiology, the shortest possible exposure time for an x-ray film to be exposed automatically.
one-stage prothrombin time prothrombin time.
prothrombin time see prothrombin time.
real time a term used to describe a recording device that shows events simultaneously to their occurrence.
thrombin time the time required for plasma fibrinogen to form thrombin; see also thrombin time.
warm ischemia time the time interval between traumatic amputation of a limb or part and its placement on ice.

aPTT

APTT

,

aPTT

activated partial thromboplastin time.

activated partial thromboplastin time (APTT)

activated partial thromboplastin time

A test that evaluates the clotting factors of the intrinsic pathway—except VII and XIII—by measuring the time required to form a fibrin clot. aPTT is used to screen for bleeding tendencies and to monitor heparin therapy; it is increased in coagulation factor deficiencies (factors V, VIII, IX, X, XI, XII), DIC, Hodgkin lymphoma, hypofibrinogenemia, leukaemia, cirrhosis, vitamin K deficiency, von Willebrand’s disease, and in drug therapy—e.g., heparin and aspirin.
 
Ref range
30–40 seconds.

aPTT

Abbreviation for activated partial thromboplastin time.

APTT

activated partial thromboplastin time.
References in periodicals archive ?
The results produced by the STart Max analyser for of the PT/ INR and the APTT for 20 randomly selected patient samples were compared with the results for the same samples produced by the CS2100i (Figures 2 a-c).
The APTT will also be prolonged in any deficiency involving the common pathways (deficiencies of factors V, X, II and to a lesser extent fibrinogen) and in the presence of inhibitors.
997 for the routine coagulation assays (PT/INR, APTT, fib) and from 0.
To learn more about APTT, visit our website at www.
Prospective teachers must pass all three sections of the APTT and there is no limit to the number of times the test can be taken.
The initial focus of the APTT will be corrosion management, monitoring, inspection and mitigation for Alaska's North Slope pipelines upstream from Pump Station 1 of the Trans-Alaska Pipeline System.
Durante el posquirurgico inmediato, el APTT expandido se acorto de 48.
There were no significant differences between the groups for average pure tone hearing threshold (APTT) or ability to discriminate pre-recorded speech presented to one ear at 35 decibels (dB) above APTT.