Great question. Yes, blood will come out if you poke almost anywhere. But for a blood test, we don’t just need blood—we need a clean, continuous sample. Veins are: ✅ Closer to the skin ✅ Larger and easier to access ✅ Low-pressure vessels (safer) ✅ Less painful than hitting arteries If we “chook” randomly, we may get: ❌ Very little blood ❌ Tissue fluid mixed with the sample ❌ Bruising and pain ❌ An inaccurate test result Think of it this way: A vein is like tapping directly into a water pipe. Poking anywhere else is like digging randomly in wet soil and hoping to collect enough water. 🩸