If you have a blood test and the calcium level in your blood is measured, it tells you how much calcium was circulating in your blood at the time of the test. It doesn't tell you anything about the level of calcium stored in your tissues. The level of calcium stored in your tissues may not match the level that shows up in your blood. In other words, you could have a normal or high level of calcium in your blood and your tissue calcium can be low.
How can this be?
Your body needs to maintain a certain range of calcium in your blood. If the level drops too low, calcium will be drawn from the tissues in order to maintain blood levels. If there is too much calcium in your blood, it will be deposited into your tissues.
Your blood gives you the levels of minerals in your body for a moment in time. Your tissues tell the story of mineral levels in your body over a period of time.
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