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.
If you are age 65 or older, you should get a bone density test to screen for osteoporosis. If you are younger than 65 and have risk factors for osteoporosis, ask your doctor or nurse if you need a bone density test before age 65.here are tests you can get to find out your bone density. This is related to how strong or fragile your bones are. One test is called dual-energy X-ray absorptiometry (DXA or dexa). A DXA scan takes X-rays of your bones. Screening tools also can be used to predict the risk of having low bone density or breaking a bone.