Yeah but microwave would be hard to get the temp right. It’s better to use hand warmers. Not that I would know anything about that.

Never tried it myself. I did provide clean urine to a friend, but I think their plan was just to wear it in/near their crotch long enough for it to warm up.

I’d imagine microwaving might work, as long as you didn’t do it too long. But, I don’t know if there’s some ions or proteins in urine that are more sensitive to microwaves than other heating methods.

Yes it contains all the markers that pass the controls of the test. Easy option for an unsupervised urine test.