How much is the minimum required blood platelet in a human body?

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it varies. Anything below 150K is considered low. However, people can live without spontaneous bleeding with platelet counts as low as around 10K. There are minimum counts that are needed for certain procedures and this depends on how invasive the procedure is. For instance, something like a joint injection is ok to do at lower levels of platelets than say, open abdominal surgery.
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They are responsible for blood clotting. This prevents too much blood loss and to some extent prevent the entry of pathogens into the body through the cut/wound.
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