Lower Back Pain (LBP) is one of the most frequent reasons for visiting physican. Authors of guidelines scrutinizing use of radiography and Computed tomography (CT) or Magnetic resonance imaging (MRI) in LBP diagnostic. Method of choice in the LBP diagnostic should be MRI except in cases where we should get diagnostic informations as soon as possible (traumas etc.) and in strict indications in bone structures where CT should be a method of choice. Increase of CT use and following icrease CT

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... ed radiation dose in patients are very serious problems of last decades. Aim: To show the nessesary of procedure algorithm adjusment in LBP diagnostic. Reasons are: danger of overdiagnosis leading to chronifications, loosing time and money to get exact diagnose and leading to cumulate very high ionizing doses (10 mSv per person with average body weight from lumbar spine CT) that could couse a cancer if it is over 100 mSv (in some studies if it is over 50 mSv). Patients and methods: Sixty-nine patients, average age of 51.35 years, were included in the study. Lumbar spine CT was performed and repeated procedure at MRI in a very short time in Clinic for Radiology and Nuclear Medicine of University Clinical Centre Tuzla from January 1 2017 to February 9 2018. The sample of patients was formed consecutively. Referral diagnosis for CT procedures were: M51 in 36 patients (52.17%), N/A in 13 (18.84%), M05 in 4 (5.8%), G83.4 in 3 (4.35%) and other in 13 (18.84%). Results: 30 (83.33%) of patients were referred from CT to MRI procedure in time under 42 days (during acute phase). Relation of justified and unjustified undertaken CT procedures were: 71% unjustified, 10% justified and 19% N/A.Conclusion: Performed study showed unjustified undertaken CT procedures and high unnecessary radiation dose in 71% patients. There are justified reasons for procedure algorithm adjusment in LBP diagnostic. Key words: lower back pain, diagnostic procedure algorithm, CT, MRI