Background:Laboratory test are done on clinical specimens in order to get information about the health of a patient as pertaining to the diagnosis, treatment and prevention of disease. Laboratory test gives 70% of information to get a right diagnosis. By some study, physiological factors such as diet, stress, exercise and sample collection techniques are influencing 32%-75% of test accuracy and reliability. That is why we want to studyhow nurses follow standard of sample collection techniques in UB.Our study conducted in 5 different hospitals. We observed nursesway of collecting sample from 150 patientsResult:Nurses did not identify patients ID in 80% of patients and did not ask test preparation and diet of 100%. They prepare necessary items to blood draw 95%. Also nurses did not fully follow blood draw standard in such way: hand sterilization, asepticize place of puncture and using bandage. Conclusion:Nurses don’t follow standard of draw blood from vein and did not clarifies patients test preparation. Pre-analysis process is the most influencing factor in the test result. So we have to train nurses to follow their standard of sample collection procedure.