Therefore, in order to reach the highest level of Set of Criteria for quality assessment 2429, the Blood Transfusion Hematology has met some of the following difficulties: 100% of tests have been performed in an external check according to the list of testing techniques, while the calibration units do not meet all the requirements; 100% of all methods have been validated; 100% of the equipments that affect to the results must be calibrated while there are no establishments announcing the eligibility for providing inspection and calibration services for the entire medical equipment.