<Li> cod = 11 mg </Li> <P> The amount of calcium in blood (more specifically, in blood plasma) can be measured as total calcium, which includes both protein - bound and free calcium . In contrast, ionized calcium is a measure of free calcium . An abnormally high level of calcium in plasma is termed hypercalcemia and an abnormally low level is termed hypocalcemia, with "abnormal" generally referring to levels outside the reference range . </P> <Table> Reference ranges for blood tests for calcium <Tr> <Td> Target </Td> <Td> Lower limit </Td> <Td> Upper limit </Td> <Td> Unit </Td> </Tr> <Tr> <Td> Ionized calcium </Td> <Td> 1.03, 1.10 </Td> <Td> 1.23, 1.30 </Td> <Td> mmol / L </Td> </Tr> <Tr> <Td> 4.1, 4.4 </Td> <Td> 4.9, 5.2 </Td> <Td> mg / dL </Td> </Tr> <Tr> <Td> Total calcium </Td> <Td> 2.1, 2.2 </Td> <Td> 2.5, 2.6, 2.8 </Td> <Td> mmol / L </Td> </Tr> <Tr> <Td> 8.4, 8.5 </Td> <Td> 10.2, 10.5 </Td> <Td> mg / dL </Td> </Tr> </Table> <Tr> <Td> Target </Td> <Td> Lower limit </Td> <Td> Upper limit </Td> <Td> Unit </Td> </Tr>

Where are calcium ions stored in the muscle cell