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Thrombolastogram

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Dr Esther Bruinette - Consultant Pathologist - MBChB, FcPath (SA) Haem

PATHCHAT NO 3: THE THROMBOELASTOGRAM (TEG)

What is thromboelastography

Thromboelastography was first described in 1948 and is actually not a new concept. It is a relatively accurate test for the global study of the coagulation process, starting from the beginning of clot formation to resolution of the clot.

The global process that is reflected on a thromboelastogram

How does TEG compare with conventional coagulation tests? How does a TEG work?

Thromboelastography is performed on a small instrument which is connected to a computer. The coagulation profile is displayed on the screen as an outline of the TEG with the range of normal values being displayed as dotted lines.

Whole blood is placed in a cup at 37°C. A suspended piston is then lowered into the cup, which rotates backwards and forwards (Figure 1). As the clot forms in the cup, the change in tension results in signal transmission onto the suspended piston, which is then converted electromagnetically into a trace picture which represents the thromboelastogram (TEG).

 

 

 

 

 

Read the full article here.