99% of calcium in the body is stored in bone. The 1% left is termed "total" calcium, and is divided as follows:
Total calcium is that which is measured but it is ionized calcium which is of clinical importance. The concentration of albumin can affect the value for total albumin, but it does not affect ionized albumin. In the lab they usually make an adjustment dependent on the concentration of albumin in the blood: corrected calcium = 0.02(40-albumin).