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 ?
4A is a correlation diagram displaying the analytical results with the two APTT procedures expressed as the deviation in SD units from the mean for 120 patients.
APTT values for the 2 plasma samples with Dabi (120 and 300 [micro]g/L) were reported by 72 laboratories.
The bleeding phenotype in these patients ranged from no bleeding tendency with isolated prolongation of APTT, to severe intramuscular hematoma and hemarthrosis necessitating rVIIa infusion and blood components transfusion.
In clinical test of blood coagulation, APTT is used to evaluate the intrinsic clotting index.
The few previous comparisons of the Hemochron INR and APTT tests with their laboratory equivalents in similar circumstances have shown similar inaccuracy.
Tests Characteristics Anti-FIIa APTT PT ECT TCT Availability No Yes Yes Yes Yes Linearity of ?
The latter finding may be attributed, at least in part, to including only high-end critical value results in the PT and APTT evaluations, as compared with comparing only the low-end critical values for WBC and PLT results.
An unexpected finding was a prolonged APTT, marked elevation of fibrinogen, and elevated coagulation factors at 72 hours post dosing with BRSV In those prior studies, there was no remaining blood for further analysis.
2] Nonstandard abbreviations: PC, protein C; TGT, thrombin generation test; PT, prothrombin time; APTT, activated partial thromboplastin time.
The normal response was a prolonged APTT in presence of APC, because of the inactivation of factors Va and VIIIa.
A If the patient is on low molecular-weight heparin (LMWH), the APTT is not a good measure of therapy as it will not elevate in relationship to the patient's LMWH level.
ABBREVIATIONS: APL = antiphospholipid antibodies; APS = antiphospholipid syndrome; APTT = activated partial thromboplastin time; [[beta].