hi,
i would advise going eidon.com and purchase a hair analasys kit, its the only way to check the mineral deffieciancy in your body, using blood to check minerals is not complete blood acts as a transport of the minerals, the minerals are stored in tissue and to get a correct reading is either a tissue sample or a hair sample, but keep up with the potassium and also magnesium because one helps the other.
god bless