is a magnesium test included in a cbc?
A CBC does not check for levels of magnesium. You will need to have some serum sent to the lab for you to know your magnesium level. In brief: Magnesium testing. A CBC does not check for levels of magnesium. You will need to have some serum sent to the lab for you to know your magnesium level.  You will need to have some serum sent to the lab for you to know your magnesium level.