Bone Density Tests – What do the results mean?
Patients who are told to get a bone density test rarely know what kind of “score” they are looking for; they only know they want it to be on the healthy side. But how can they tell what the alphanumeric scores really mean? Using bone densitometer medical equipment, doctors score the test using a “T” and “Z” scores to represent the condition of a patient’s bones in comparison to a normal healthy adult of the same age. Since the “T” represents the patient’s bone density and the “Z” the benchmark, the T-score is considered the more vital of the two. Normally reported in the minus or negative range, the lower this number is the greater the risk of osteoporosis and fracture.
What is normal bone density? Bone mineral density, or BMD, is scored in a tight range of T-scores between -1 and +1 using a medical device called a bone densitometer. Higher scores on the T scale indicate a normal level of bone density and will not require further treatment. However, patients with BMD scores in the negative range will need to be closely monitored. One thing that seems to work well is regular weight-bearing exercise along with adequate amounts of vitamin D and calcium in the diet.
What is low bone mass? Also known as osteopenia, this condition is common among post-menopausal women. It describes the patient with bones that are less dense than they should be but haven’t yet reached the osteoporosis level. People with this condition will have a T-score of -1.1 through -2.4.
How can a patient know they have osteoporosis? Anyone with a T-score below -2.5 will be diagnosed with osteoporosis. The lower the number on the bone densitometer, the greater the risk of fracture.
Which patients are sent for BMD testing? Normally, patients with multiple risk factors for osteoporosis are sent for testing at a physician’s office or hospital. Or, if initial medical equipment testing reveals a surprisingly low T-score, they may be advised to get a more thorough form of BMD screening in the hip or spine.

