1.  No.  The condition of large platelets with a normal total platelet count
is called "macrothrombocytosis".
2.  "Thrombocytopenia" is when the count is low, even when including the
large platelets.  In some studies, the mortality rate for true
thrombocytopenia is about 30% (all breeds).
3.  At this point, there is no known reason to breed away from the condition
of macrothrombocytosis -- in past studies, the large platelets have appeared
to function normally when the total platelet count is normal.
Thrombocytopenia is often an autoimmune process; most reputable breeders
attempt to breed away from autoimmune disease.

I believe that further studies are ongoing; maybe in a year or so, we'll
have more answers.

Leanne



----- Original Message -----
1.  Is a Cavalier that has large platelets that have to be hand
counted considered affected with Thrombocytopenia?  2.  Or only a Cavalier
that
has a low platelet count, including both large and small platelets.  3.
Should
breeders be testing for the presence of large platelets and breeding away
from this condition?

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