They have blood tests for both (serum or RBC):
replyThe Magnesium RBC Test measures magnesium inside red blood cells, providing a more accurate assessment of magnesium status than serum tests.
wouldn't a cell deficiency lead to it depleting also the magnesium levels in the blood, simply based on osmosis?
replyThe organism dumps Mg on the blood as much as necessary because it needs to remain in stable concentrations.
replyWhen a serum Mg test comes out low, the patient already has severe deficiency and visible symptoms, so isn’t very useful unless you’re investigating a systemic issue.
As explained by my endocrinologist.
If blood concentrations drop, you die.
replywhat is a good test for magnesium deficiency?
replyThey only have blood tests, and that's not very useful.
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