Quick's test

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Related to Quick's test: prothrombin


a glycoprotein present in the plasma that is converted into thrombin by extrinsic thromboplastin during the second stage of blood clotting; called also factor II.
prothrombin consumption a clinical laboratory test done to determine thromboplastin generating capacity, which provides information about the first stage of blood clotting. When clotting of a normal blood sample occurs, prothrombin is converted to thrombin; thus there should be little or no prothrombin in the serum after the clot is formed. If, however, there is deficiency of blood clotting (coagulation), some of the prothrombin will not be utilized (consumed). Abnormal results of the test are found in deficiencies of the first-stage coagulation factors (factors VIII and IX), and in the presence of circulating anticoagulants, thrombocytopenia, and any other condition leading to inadequate generation of thromboplastin.
prothrombin consumption test a test to measure the formation of intrinsic thromboplastin by determining the residual serum prothrombin after blood clotting is complete.
prothrombin time a test to measure the activity of coagulation factors I, II, V, VII, and X, which participate in the extrinsic pathway of coagulation; abbreviated Pro time or PT. Called also one-stage prothrombin time and Quick's test. Deficiency of any of these factors leads to a prolongation of the one-stage prothrombin times, as will circulating anticoagulants that are active against factors V and VII or against thromboplastin.

The test is considered basic to any study of the clotting process and is also widely used for guidance in establishing and maintaining anticoagulant therapy. Test results are best understood when both the patient's and the control times are reported. The therapeutic range for coagulation therapy is usually 2 to 3 times that of the normal (12 to 15 sec.) control.


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.

Quick's test