<P> Blood serum is blood plasma without clotting factors . </P> <P> Plasmapheresis is a medical therapy that involves blood plasma extraction, treatment, and reintegration . </P> <P> Fresh frozen plasma is on the WHO Model List of Essential Medicines, the most important medications needed in a basic health system . It is of critical importance in the treatment of many types of trauma which result in blood loss, and is therefore kept stocked universally in all medical facilities capable of treating trauma (ex. trauma centers, hospitals, and ambulances) or that pose a risk of patient blood loss such as surgical suite facilities . </P> <Table> <Tr> <Th> Ion </Th> <Th> Normal concentration range (mEq. L) </Th> </Tr> <Tr> <Td> Sodium </Td> <Td> 135--145 </Td> </Tr> <Tr> <Td> Potassium </Td> <Td> 3.6--5.1 </Td> </Tr> <Tr> <Td> Chloride </Td> <Td> 95--105 </Td> </Tr> <Tr> <Td> Calcium </Td> <Td> 2.0 </Td> </Tr> </Table>

Where is blood plasma made in the body