What exactly are they going to do to me when I have the ABG test?

I have had pulmonary function tests many times because I have asthma, but I don't know anything about what they will do to me when they do it with arterial blood gasses. Can somebody explain it thoroughly? If I just know what is going to happen, I'll be fine. It's the surprises that get me upset. Thanks in advance for your help.

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