When you have blood taken, how many tries does it take them to either find a vein or get blood from it?

I had five needles before they were able to get blood out of me today

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SW-User

If it’s in my right arm, one go. In my left there’s scar tissue from when I used to poke the coke, and when I used to do that it used to take several goes till I found a vein and I always thought (how do the blood nurses get it first go?) 🤣😂