Does EDTA prevent platelet clumping?
EDTA-dependent PTCP can be recognized by the presence of platelet clumps in the peripheral smear of blood anticoagulated with EDTA. The aggregation of platelets in EDTA-dependent PTCP usually is prevented by other anticoagulants, such as sodium citrate or heparin2).
Does EDTA affect platelet count?
It inhibits clotting by removing or chelating calcium from the blood. EDTA most important advantage is that it does not distort blood cells, making it ideal for the most hematological tests. It is known to cause erroneous results of platelet counts by automated hematological analysers yielding low platelets counts.
What does platelet clumping indicate?
Platelet clumping occurs when the blood platelets responsible for coagulation stick to one another to form clusters. The presence of platelet clumping has no clinical consequences other than preventing instruments from properly counting blood platelets.
Which tube stops platelet clumping?
Many labs will have an alternate tube drawn or use another method to help resolve the clumping. Less commonly used tubes are CTAD (trisodium citrate, theophylline, adenosine, dipyridamole) and heparin. CTAD acts directly on platelets and inhibits platelet factor 4 thus minimizing platelet activation.
What causes platelet clumping in blood test?
The most common mechanism is platelet clumping. Clumping is most often due to the anticoagulant ethylenediaminetetraacetic acid (EDTA) but may also result from autoantibodies, such as cold agglutinins. The presence of giant platelets and platelet satellitism may also yield falsely low automated platelet counts.
What diseases cause platelet clumping?
Among the 18 cases where PTCP or platelet clumping was related to viral infection, hepatitis A virus infection (72.2%) was most common, followed by cytomegalovirus (11.1%) and influenza A H1N1 infections (5.6%).
What can cause platelet clumping?
Platelet clumping can lead to a falsely decreased automated platelet count. Causes of platelet clumping include platelet activation (due to traumatic venipuncture) and EDTA-dependent antibodies that react with platelet glycoprotein IIb/IIIa.
What causes platelets clumping?
Decreased platelet production
What does it mean when platelets are clumped?
Platelet clumping occurs when the blood platelets responsible for coagulation stick to one another to form clusters. When the number of platelets is below normal, a microscope platelet count is automatically performed to ensure that the low number of platelets was not due to the presence of a large number of clumps.
What makes platelets clump?
Platelet clumping occurs when the blood platelets responsible for coagulation stick to one another to form clusters. The presence of platelet clumping has no clinical consequences other than preventing instruments from properly counting blood platelets. Platelet clumps tend to form in samples collected with difficulty and in a small number of