Agree 100%. You body works hard to maintain blood levels, even if it needs to steal it from your cells.
For example, if you blood is acidic, calcium will be stolen from your bones to neutralize it. So your blood calcium is fine, even though you may be on your way to bone loss.
And make sure you get a copy of all your labs. Don't just let him say "it's normal".
If the range of something is 50-500, and you have 51.....they call that normal......just one point from having an illness. As if it were like throwing a switch.