Medically reviewed by Arno Kroner, DAOM Key Takeaways Calcium from food or supplements can raise blood calcium levels slightly within hours, but blood levels are tightly regulated.Unabsorbed calcium ...

Vitamin D deficiency, rampant in India at 70–90% of the population, adds another layer of trouble by curbing calcium ...

Laboratory reference ranges reflect methods, populations, and policies, and experienced clinicians interpret them in context rather than applying fixed cutoffs theoretically.