LAB 13

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Created by
EULA

Cards (7)

  • Bleeding Time (Duke's Method)

    Place a slide behind and in close contact with the ear lobe.
    2. Pierce the ear lobe who a spring lancet adjusted to 2 mm. cutting depth.
  • Coagulation Time (Capillary Tube Method)

    Freely flowing blood from a skin puncture wound is collected in several capillary tubes.
    2. The tubes are held in the hand to keep them at approximate body temperature.
    3. At 30 secs. Intervals, the tube is broken. Continue breaking the tube until a fibrin strand appears between the two separated pats of the tube.
  • Bleeding Time (Duke's Method)

    This is a test for capillary contractility. This test measures the time required for bleeding to stop after a standardized stab wound.
  • Bleeding Time (Duke's Method)
    • The normal range is 2-5 minutes. This result is influenced by:
    1. size and shape of the instrument
    2. force applied in setting the injury
    3. depth of the structure
    4. location; texture and vascularity of the area selected.
  • Coagulation Time

    The interval of time between the collection of blood and the appearance of fibrin is the coagulation time. This procedure tests the composite action of all plasma factors acting simultaneously.
  • Coagulation Time

    • The normal coagulation time with the use of the capillary tube method ranges from 1-5 minutes. This value is increased in any disease in which there is an absence of/or very small amounts of the essential coagulation components; also, in fibrinolytic diseases and conditions with increase in inhibitor factors.
  • Difference between Bleeding and Coagulation Times

    1. In skin bleeding time, tissue and blood vessels play an important part in stopping flow of blood; whereas in coagulation time, there is no blood vessel factor and tissue actor are minimal.
    2. In skin bleeding time, the character of the clot is all important, for a feeble, poorly adherent and non-retractile clot is incapable of closing the wound adequately and is swept away by flowing blood as fast as it is formed. In coagulation time, the strength of the clot and its ability to retract are not involved.