In a normal adult body, the number of platelets is about 150 to 400 x 109 per liter of blood. This is equivalent to 150,000/mm3 to 400,000/mm3. * For 5 liters of blood, the total would be 7.5 x 1011 to 2.0 x 1012 platelets.
The average human body produces about 1 x 1011 platelets each day.
(* sometimes expressed as "1.5 lakhs" (lacs), based on the Hindu number for 100,000)
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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.
There are many millions of platelets in the human body, but the number varies with a person's size and blood volume