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125). The students were observed three times more in the following week without their knowledge. There was a statistically significant difference between the first and the third unannounced observations (p=0.001). In order to perform phlebotomy correctly, apart from theoretical education, a close follow-up is necessary too. In order to perform phlebotomy correctly, apart from theoretical education, a close follow-up is necessary too. The goal of this study was to assess the oxidative stress status through the values of antioxidant defense