If a patient is osteopenic, his bone density level measured by T-score is between -1.0 and -2.5, states the National Osteoporosis Foundation. T-scores of -1.0 and higher, including positive T-scores, represent normal bone density, and T-scores of -2.5 and lower represent osteoporosis.
Alternatively, a Z-score can be used to compare the patient's bone density with that of other people his own age, and Z-scores higher than -2.0 do not represent osteopenia, or low bone density, reports the National Osteoporosis Foundation. Someone with osteopenia has a greater risk of developing osteoporosis if future bone loss occurs. Taking osteoporosis medicine can benefit men at least 50 years old and women who have undergone menopause, have low bone density or have other risk factors.