The modern age, modern technology and, above all, a sedentary lifestyle are the prelude to densitometry. Densitometry is a diagnostic method that uses a specialized ionizing device, a densitometer, to diagnose bone density disorders. Bone density disorder is characterized by impaired bone microarchitecture and depending on the intensity of bone damage it is osteopenia or osteoporosis. The causes of bone density disorders are numerous, from inactivity to eating disorders and as a consequence of some other disease states of the organism. Text briefly deals with the topic of bone density disorders, and the emphasis is on the examination itself and the device that diagnoses the disorder or systemic disease, osteoporosis. The factors on which the finding of densitometry, race, age, sex depends are described in detail. The most frequently recorded regions are specifically described in the chapter Findings by regions of interest. In addition to the method of recording and the process of obtaining densitometry results, the course of performing densitometric imaging and the positioning of the patient as well as the necessary preparation of the patient for imaging are described. Since it is an ionizing device, which uses Xrays for work, patients sign a consent to perform the examination, and the preparation is to remove all metals from the recorded region. The diagnostic method is fast, non-invasive, and it is possible to find out the bone mineral density for each individual region of the body. Key words: