CLOTTING TIME
CLOTTING TIME
Apparatus
Required: 1. Pricking Needle.
2.
Fine Capillary tube nearly 6 inches long.
3.
Stop watch.
Technique: Clean the finger and
puncture sharply the tip of the finger with pricking needle so that blood flow
freely. Discard the first 2 drops and then till the capillary tube up to 3/4 of
its total length with blood capillary tube will be filled by capillary action
when the tube is held against a drop of blood Note the time by the stop watch
when the puncture is made. Proceed to gently break a small portion of the tube
from one end and every 15 seconds until a thin film or unbroken coagulam is
seen stretching between the 2 broken ends and note the time when it happens.
The
difference between the two timings by the stop watch is the Coagulation time.
Normal -3 to 10 minutes CT > | Haemopbilta
BT-Normal
Question: Why bleeding time is less
then clotting time?
BLEEDING TIME
Apparatus
required: 1. Pricking Needle
2.
Filter Paper
3.
Stop watch
Method: Duke’s Method
Clean
the ear lobe tip of the finger with alcohol. Prick the selected site fairly
deep so that blood flows freely. Soak up the blood with filter paper without
touching the skin. Not the time by stop watch. Continue to soak the blood with
filter paper without squeezing or pressing the finger every 1/2 minute until
the filter paper is no longer stained with blood i.e. bleeding has stopped. The
time from the first appearance of the blood until the cessation bleeding is the
bleeding time.
Normal Limit: 1 to 3 minutes.
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