hema 2 new Flashcards
Measures the time taken for small blood vessels to stop bleeding
Bleeding Time (BT)
Standardized incision on the forearm, blotting every 30 seconds until bleeding stops.
Ivy Method
Puncture on the earlobe or fingertip, blotting every 30 seconds.
Duke Method
Uses a standardized device for
incision, ensuring uniformity
Template Method
Measures the ability of platelets to form a primary plug
Bleeding Time
Factors affecting BT
Platelet disorders
Vascular disorders
Use of aspirin or anticoagulants
Normal Values BT
Ivy Method: 3-6 minutes (Borderline: 6-11 minutes)
Duke Method: 1-3 minutes
Template Method: 2-7 minutes
Measures the time required for blood to clot in vitro.
Clotting Time (CT)
Blood is drawn into a capillary
tube and observed for clot formation.
Capillary Tube Method
Blood drops on a slide are
checked for cloing.
Slide Drop Method
Uses venous blood in a test
tube, checked at intervals for clot formation
Lee and White Method
Evaluates the coagulation cascade, primarily intrinsic and common pathways
Clotting Time
Factors affecting CT
Coagulation disorders
Anticoagulant therapy
Liver disease
Clotting Time - Normal Values
● Capillary Tube Method: 4-9 minutes
● Slide Method: 2-4 minutes
● Lee and White Method: 7-15 minutes
Indicates platelet dysfunction, thrombocytopenia, von Willebrand
disease
Prolonged Bleeding Time
Suggests hemophilia, liver
disease, anticoagulant therapy
Prolonged Cloing Time
Possible disseminated intravascular
coagulation (DIC) or severe coagulation factor deficiencies
Both Prolonged
