查血 meaning in Chinese

have a blood test

Please don ' t eat anything until blood test tomorrow morning
明早查血以前不要吃东西
Please don ' t eat anything tomorrow morning before blood test
明早查血以前不要吃东西。
Please go to the laboratory with the slip and they will do the test
请拿着这张单子到化验室去，他们会为你查血的。
After infection is venereal , how long can check the most quickly come out , it is to pass what method inspection commonly , be urinalysis still checks blood for instance
感染性病后，最快多久可以检查出来，一般都是通过什么手段检查，比如是验尿还是查血？