there are a whole 'series' of tests that are 'add-ons' to that.
From experience, my Endo ordered various Vit and Mineral extras for calcium asorbtion, Vit-D and Magnesium... I'll look up the test codes and PM you with them [earlier this year]. It all was VERY revealing in what I did and did not have floating around in that blood! Thing is, you have to know what you are looking for to find what you want? Most docs do the basic 'comprehensive blood panels' but not the metabolics, I have found over the ages - and they often are not senstitive to the other needs of those of us who are asorbtion compromised may have. I gets muzzier the more detailed things can get.
I'll get that info to you! - j