The pre-analytic phase covers in chronological order; From the physician's request, indication, patient preparation, obtaining the primary sample, transportation to and within the laboratory, and ending when the analytical procedure begins. The objective of this study was to evaluate quality practices in the pre-analytical phase of different clinical laboratories of the Metropolitan Area of ​​the Valley of Aburrá. A descriptive cross-sectional study was carried out during, where 14 laboratories were analyzed, Secretaries, laboratory assistants, bacteriologists and physicians. As results, it was obtained that the requests for examinations are made in printed form by the attending physician in 85.7% of the laboratories, verbal requests are not made in 42.9%, the orders are verified with the doctor in the In case of finding an abnormality in the request of the exam 64.3%, the auxiliary staff is given training for the sample 71.4%, and who provides the indications for the analysis is the secretary or receptionist in 42, 9%. 87.55% of the laboratories have a manual for the pre-analytical phase and 71.4% of the auxiliaries knew the manual in the training of sampling. When there is an error in the request for the exams Errors such as patient name are given in 42.9% and verification with patients of the conditions for sampling in 85.7% of laboratories evaluated. It can be evidenced that in the laboratories surveyed the quality conditions in the processes of the pre-analytic phase must be improved since they are not being fulfilled according to the norms established by the Systems of Quality Management.