تطابق نتیجه میانگین عموم و مقدار هدف14 کمیت بیوشیمی در ارزیابی کیفی خارجی آزمایشگاههای تهران، 81-1374

Background : External quality assessment referred to the survey of different laboratories' results of a unique specimen as compared with a reliable reference. These assessments have been introduced since 1988 in Iran . Results were processed according to techniques of measurement and their accuracy was checked against the reference value. Methods : We have gathered results of 14 parameters in 9 courses of external quality assessment, then compare the mean of each course with the expected value using paired t-test. Results : Results have revealed the coincidence of measured parameters with expected results. Conclusion : Despite the empirical nature of consensus hypothesis, it is revealed to be true in external quality assessment, thus it can be used to calculate the target value.