Clinical biochemistry laboratory rejection rates due to various types of preanalytical errors

Introduction:

Preanalytical errors, along the process from the beginning of test requests to the admissions of the specimens to the laboratory, cause the rejection of samples. The aim of this study was to better explain the reasons of rejected samples, regarding to their rates in certain test groups in our laboratory.

Materials and methods:

This preliminary study was designed on the rejected samples in one-year period, based on the rates and types of inappropriateness. Test requests and blood samples of clinical chemistry, immunoassay, hematology, glycated hemoglobin, coagulation and erythrocyte sedimentation rate test units were evaluated. Types of inappropriateness were evaluated as follows: improperly labelled samples, hemolysed, clotted specimen, insufficient volume of specimen and total request errors.

Results:

A total of 5,183,582 test requests from 1,035,743 blood collection tubes were considered. The total rejection rate was 0.65 %. The rejection rate of coagulation group was significantly higher (2.28%) than the other test groups (P < 0.001) including insufficient volume of specimen error rate as 1.38%. Rejection rates of hemolysis, clotted specimen and insufficient volume of sample error were found to be 8%, 24% and 34%, respectively. Total request errors, particularly, for unintelligible requests were 32% of the total for inpatients.

Conclusions:

The errors were especially attributable to unintelligible requests of inappropriate test requests, improperly labelled samples for inpatients and blood drawing errors especially due to insufficient volume of specimens in a coagulation test group. Further studies should be performed after corrective and preventive actions to detect a possible decrease in rejecting samples.     

An effective intervention with a blended learning environment for improving cognitive learning and spiritual meaning

According to cognitive and spiritual developmental theories, individuals construct and transcend their previous thought processes by incorporating more sophisticated ways of understanding the world as they progress through stages requiring efforts in different modes of thought. These theories focus on the importance of contextual variables in development and emphasize that these variables will spark a change in cognitive and spiritual development or awareness. We have investigated the effects of blended learning on cognitive learning and spiritual interpretations of science teacher candidates. The study with a quasi-experimental design had 54 science teacher candidates attending the science education department of a state university in Turkey. Our study showed that when learning Einstein’s theory of special relativity, a blended learning environment affects students’ cognitive learning positively. In the spiritual sense, too, significant results were found in favor of the blended learning group students. This effect that triggers spiritual change has been discussed in two contexts: “the effect embedded in the variable” and “indirect effect from the variable.” If supported by further research, the results of this study suggest that the spiritual dimension can be incorporated into three domains of learning, namely cognitive, affective, and psychomotor.