Clotting Time CT
Clotting time CT is the time that is required to form the clot of blood. The most commonly used test of clotting time is activated partial thromboplastin time (APTT) and prothrombin time (PT). A fresh blood sample is required for the clotting time test. Clotting time is advised to find a bleeding disorder. Most likely due to clotting factor defiance and also diagnosis of hemophilia.
Is This Test have Another Name
Clotting Time, CT.
How The Test Performed
A blood sample is needed.
There are two ways to do a clotting time test.
1. Capillary Method
Two drops of fresh blood on a glass slide. After that capillary tube aged with blood. Blood will automatically fill the capillary tube. Leave the tube slightly empty. And broke a small part of the tube at ten-second intervals. And see if there is a clotting blood or not. Note the time when the blood clot is visible. This will be your endpoint and clotting time.
2. Test Tube Method.
- Perform this test at 37 ° C.
- Take 4 ml of blood for the tube method and start the time.
- Note the time when there is the first appearance of the clot formation.
- This test can be done in multiple tubes to be more accurate.
Note: In some cases, the clotting time will increase, the following are important in this.
- Use of Heparin
- Lack of fibrinogen
Lee And White Method:
- Two siliconized tubes with a 10 cms external bore are taken.
- These tubes are prewarmed at 37 °C in a water bath.
- Take the blood sample, mostly taken from the antecubital vein.
- 2 to 2.5 mL of the blood is taken, and 1 mL of the blood is in each test tube.
- Start two stopwatches as you see the blood in the syringe.
- Keep the blood in the water bath and check for clotting by tilting each tube at 30 to 60 seconds intervals.
- Tilt the tube to greater than 90 degrees.
- Stop the stopwatch as you see the clot in the tube.
- Clotting time is expressed as the mean of the two stopwatches.
What Do The Result Means
A normal result of clotting time CT is 04 minutes to 10 minutes. And the glass tube’s normal range is 05 minutes to 15 minutes.
- Coagulation Time Normal Seen In:
- Deficiency factor VII.
- Mild coagulation defects due to any reason.
- Von Willebrand syndrome.