Abstract
Background and Objectives
Over-ordering of blood before operation can cause unnecessary cross matches and wastages. The aim of this study was to investigate the difference between blood order and transfusion in Yazd, with Maximum surgical blood ordering (MSBOS). 
 
Materials and Methods
In this descriptive study, data of 793 patients from 2017 to 2018 were recorded in a questionnaire based on the studied variables (demographic information, Red blood cell ordering, and surgical type). Simultaneously, surgical blood ordering was compared with MSBOS; frequency of blood order and transfusion, number of units per application sheet, and C/T ratio for all patients were calculated. The analysis was made by SPSS software and descriptive statistics.
 
Results
Surgical operations were performed on 615 patients; in 264 (42.92%) patients the number of blood orders was compatible with MSBOS. Cesarean  (83 units), hernia surgery (52 units), curettage (48 units), appendectomy (28 units), and arthroplasty (24 units) had been assigned the highest blood orders with the MSBOS compatibility rates being 1%, 83%, 15%, 71%, and 29%, respectively. The highest ratio of transfusion to blood orders was related to oncology wards (0.92), heart surgery (0.79), and NICU (0.75). Urology (0.04), ENT (0.09), and Orthopedy (0.22) had the lowest ratios of transfusion to blood orders. The highest C/T ratio was observed at woman urology ward. 
 
Conclusions 
According to the results, requesting blood for surgical operations was not compatible with the MSBOS table and despite the decrease in the C/T ratio in the hospitals compared to 2013 studies, this index is still far from the standard.