Negative predictive value of the chorionic villous sampling (CVS) in diagnosis of thalassemia in genetic laboratory of Dastgheib Hospital, Shiraz, Iran, 2012.

respectively. Also, the negative predictive values for diagnosis of major and minor thalassemia were 100% and 89.2%, respectively. No relationships were found between the gestational age and the test results. Conclusion: The results of this study showed that CVS genetic testing in genetic laboratory of Dastgheib Hospital was valid and had a high diagnostic value. Thus, minor couples can undergo this test with relative safety in order to prevent major thalassemia.