28 Questions
What is the primary aim of determining the bleeding time of a patient?
To evaluate the platelet function and the body's ability to stop blood flow completely
What is being assessed when determining the bleeding time of a patient?
Platelet function
What is the bleeding time test used to evaluate?
The body's ability to stop blood flow completely
What is the significance of determining the bleeding time of a patient?
To evaluate the platelet function and the body's ability to stop blood flow completely
What is the bleeding time test used to determine?
The time it takes for blood to stop flowing
What is the definition of bleeding?
The loss of blood from damaged or injured small vessels
What is hemostasis?
The mechanism of preventing blood loss through an injured vessel
What is the usual bleeding time?
2-6 minutes
What is bleeding time?
The time interval from oozing of blood after a cut or injury till arrest of bleeding
What is the relationship between bleeding time and hemostasis?
Hemostasis is the process that stops bleeding time
What is the pressure raised to in Ivy's method of determining bleeding time?
40 mm Hg
What is the relationship between spots and minutes in bleeding time calculation?
2 spots = 1 minute
Where is the cuff of the BP apparatus applied in Ivy's method?
Upper arm
What is the unit of measurement for the pressure raised in Ivy's method?
mm Hg
What is the purpose of applying the cuff of the BP apparatus in Ivy's method?
To occlude the blood vessel
What is the depth of the incision made in the lower part of the ear lobe?
4-3 mm
What is the purpose of wiping the blood with a filter paper?
To remove excess blood
What is the next step after the blood fails to appear on the filter paper?
Stop the stop watch
What is the final step in the bleeding time test?
Recording the result
What is the purpose of using a filter paper in the bleeding time test?
To observe the bleeding time
What is the normal range of clotting time?
2-8 minutes
What is the purpose of cleaning the finger with alcohol 70% in the capillary tube method?
To prevent infection
In which of the following cases is prolonged bleeding time commonly found?
Platelet dysfunction
What is the primary function of the lancet in the clotting time test?
To prick the finger
What is the significance of breaking small pieces of the capillary tube every 30 seconds?
To observe clot formation
What is the primary material used in the glass container method?
Glass containers
Why is it important to allow the finger to dry after cleaning with alcohol 70%?
To ensure proper adhesion of the cotton
What is the primary function of the stop watch in the clotting time test?
To measure bleeding time
Study Notes
Bleeding Time
- Bleeding time is the time interval from oozing of blood after a cut or injury till arrest of bleeding, usually 2-6 minutes.
- Hemostasis is the process of preventing blood loss through the injured vessel.
- The usual method of measuring bleeding time involves making a small incision on the earlobe or finger, and then measuring the time until the bleeding stops.
- The bleeding time can be prolonged when the platelet count is below 50,000/μL or when there is platelet dysfunction.
Ivy's Method
- Ivy's method is a technique used to measure bleeding time, which involves applying a BP cuff to the upper arm and raising the pressure to 40 mm Hg.
- The normal bleeding time by this method is up to 9 minutes.
- This method is used on the front of the forearm.
Clotting Time
- Clotting time is the time interval from oozing of blood after a cut or injury till formation of a clot, usually 2-8 minutes.
- The aim of measuring clotting time is to determine the clotting time of a subject.
- The materials needed for the clotting time test include fine capillary glass tubes, a lancet, a stop watch, and cotton and 70% alcohol.
- There are two methods for measuring clotting time: the Glass Container Method (Lee and White Method) and the Capillary Tube Method.
Capillary Tube Method
- The Capillary Tube Method involves cleaning the finger with 70% alcohol, pricking the finger with a lancet, and drawing blood up into a capillary glass tube.
- The stop watch is started, and the blood is then broken into small pieces every 30 seconds until a fibrin thread is seen between the two broken ends.
This quiz covers the concept of bleeding time, its measurement, and factors affecting it, including platelet count and dysfunction.
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