At my local nuffield hospital, I had a blood test where blood was drawn from my left mid arm. This was to give me a comparison value to measure my blood glucose against. At home, especially after warming up my hands to the point of them turning red, my fasting glucose is considerably higher. This has me scared as I don't know which results are the truth. Arm: 5.1 Home: 6.9 How accurate are the arm blood tests? Edit: Forgot to say I have Raynaud's. Will this affect my results from the arm as much as my hands?