CLOTTING TIME

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 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.

                BT > in jaundice Survey Vit. K. deficiency purpura in Thrombo cytopenic purpura Bleeding tim 5 > but CT -5 normal.

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