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Blood is made up of cells and a liquid.
The cellular portion comprises approximately 35-45% of the total
volume. When the cellular percentage drops below 10-12% a transfusion
is considered. Although transfusions can be life saving there are
some negative aspects to consider as well.
Animal blood can be typed and cross
matched if repeated transfusions are needed to reduce the risk of
an allergic reaction. In many animal hospitals across the country
there is often a hospital donor cat and/or dog that can be called
upon to donate blood if needed. For those hospitals that do not
have a donor readily available there is a blood bank service available.
In most cases it is best to try to
stabilize the pet's blood system if at all possible and thus avoid
a transfusion. As the concentration of cells drops in the blood
stream there is an automatic stimulus for the bone marrow to produce
more cells. If this change happens slowly enough the cells can be
replaced without needing a transfusion. If there is a rapid blood
loss there may not be enough time for the bone marrow to respond
adequately. If a transfusion is given the stimulus to replace the
cells is lost temporarily. A transfusion usually will last for approximately
30 days.
There are certain diseases and parasites
that can be transmitted in a transfusion. Both Felv and FIV can
be carried in a transfusion. The parasite hemobartenella can also
be transfused to a new host in this manner. The most common problem
with transfusions is an allergic reaction and not the transmission
of a disease or parasite.
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