Blood analysis is much much more reliable than hair. Hair concentrations are highly variable due to hair type, colour, race, and contamination etc and can not be used to give an accurate indication of your body calcium. It is not possible to diagnose a person based on hair mineral analysis.
Simply - do not trust the hair analysis..... If you are worried, get your blood analysed somewhere else.
Any one telling you to buy something probably has a financial motive. If someone is telling you don't need to buy anything - there's a good chance they are being truthful.
Sorry to misinform you but blood calcium levels are far more accurate. You need SERUM calcium and Corrected calcium levels checked. There are too many 'hair analysis' people out there giving people false information. Only heavy metals can be in the hair and by them I mean Lead, Arsenic and Mercury amongst others. Calcium is minute trace in the hair, it is the blood levels that are far more accurate by a bazillion degree.
Ask your endo for a copy of the calcium results. If in doubt go to your local doctor and ask for the serum and corrected calcium levels done again.