You will be given both a T and Z score when you have a Dexa scan. The T score indicates whether your bone density falls within a normal range for a person in her 30s, when bone density peaks, while the Z score is a comparison against other individuals of your age, sex and weight.
If your T score is above 1, your Dexa scan is considered normal. If you score below this number, the scan indicates you have either osteoporosis or osteopenia, the precursor to the condition. The Z score is given in the same format and can help your physician indicate whether you are suffering from a secondary form of osteoporosis.
This test is usually covered by most types of medical insurance and Medicare.