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Why do I have to take blood pot test when I passed urine?

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I have alrdy passed urine test 4 pot now my doc said I am 2 submitt blood 4 glucose testing.problem is when I saw parts on the paper blckd out I looked harder and saw orders 4 pot testing, in med terms o course.how long does pot stay in blood?I rarely smoke but I have within the past mnth 2 days aftr urine test.only a few hits.will I pass?