<s>[INST] Do I have to fast prior to the bone density test? [/INST] No, but many testing centers ask that you not take calcium supplements during the 24 hours before your test. This is because as the tablet goes through your digestive tract, it may obscure the view of one of your spine bones. Source: American Bone Health. Link: https://americanbonehealth.org/frequently-asked-questions/. Field: Rheumatology. Disease: Ostoeporosis </s>