Photo Credit George Doyle/Stockbyte/Getty Images. If a person experiences a drop in blood pressure, fever, diarrhea, loss of hydration from vomiting or dizziness, lightheadedness can occur. Further, if the brain does not receive enough blood, it can cause lightheadedness as well.eart Attack. Heart attack is one of the more serious conditions that cause lightheadedness. During a heart attack, oxygen is prevented from getting to the heart and the rest of the body when blood vessels are blocked, causing the head to feel light and weightless.
Screening for Osteoporosis. 1  An easy and painless procedure, an osteoporosis screening requires you to place your foot in an ultrasound device called a bone densitometer. 2  This device then measures the bone mineral density of your heel.steoporosis Screening/Bone Density Test. Osteoporosis is a disease in which bone becomes extremely fragile. Bone is a complex living tissue that can be weakened by poor diet and lack of exercise.
Bone densitometry is used to measure the bone mineral content and density. This measurement can indicate decreased bone mass, a condition in which bones are more brittle and more prone to break or fracture easily.Bone densitometry is used primarily to diagnose osteoporosis and to determine fracture risk.est results. The bone densitometry test determines the bone mineral density (BMD). Your BMD is compared to two norms--healthy young adults (your T-score) and age-matched (your Z-score).