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4 Ways to Prepare for a Blood Test wikiHow Why is fasting important before blood tests? Fasting for 12 hours helps ensure accurate glucose and lipid levels, leading to precise results and correct diagnosis. Just water is allowedno food, alcohol Does your blood test show you if you are taking drugs and smoking weed? Justbob Can you test for thirdhand smoke? Thirdhand Smoke Resource Center What You Need to Know About Fasting for a Blood Test Precision Labs
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