What do these terms stand for? (Read info.)

Call the hospital and ask to be sure.

I would guess the immunoperox ab1 is for some kind of antiseptic treatment and the G&M means gown and mask level IV.

Sometime the hospitals/health care clinics have to make things sound impressive to make the insurance companies more willing to pay for something.

When my mom was working home health in the 1970s they got more state funding if they changed bedsores to chronic debucitis ulcers on their reports.

If you have insurance and its after hours, you can try calling your insurance company. They would tell you what it is for and if they cover it or not.
If you don’t have insurance than do as @WestRiverrat suggest. Billing in the hospital should tell you. There should be a number to call on the bill.

I Googled too, and found the same sites, but I still don’t know what they really are.

By the looks of it, they’re two different kinds of blood test, looking for different (though possibly related) things.

The key to understanding here is research. When you find a term that you don’t understand, look it up, so that when you see ten dollar word you know that it means [important but actually kinda simple process].
It’s lengthy, but it’s a way to learn. Google, Wikipedia, and Wikitionary are your allies here. Some Wiki articles have a simple.wikipedia.org page.

Granulocyte/macrophage colony stimulating factor
A substance produced by cells of the immune system that stimulates the attack upon foreign cells. Used to treat prostate cancers as a genetically engineered component of a vaccine that stimulates the body to attack prostate tissue.

Immunoperoxidase
Immunoperoxidase is a type of immunostain used in molecular biology, medical research, and clinical diagnostics. In particular, immunoperoxidase reactions refer to a sub-class of immunohistochemical or immunocytochemical procedures in which the antibodies are visualized via a peroxidase-catalyzed reaction.

Looks to me like these are ways of looking for antigens. What they are looking for antigens for depends on what you are being diagnosed for. But it might be some form of cancer and they are looking for the antigens that indicate your body is fighting it. That’s just a guess. I’m not a doctor. I’ve never seen these terms before.

I had a friend who had a surgery a couple years ago. One day, while he was recuperating in the hospital room, a doctor poked his head in the door and ask my friend how he was doing? My friend replied basically he was OK or maybe a few more syllables…

For that, the doctor send him a bill. I guess the doctor wanted new Jet Skis for the summer or something.