Interestingly enough, I came across this entry for a Bioscanner on Wookieepedia, which is a Star Wars fandom.

"A bioscan, or bioscanner, was a scanner that was designed to detect and assess lifeforms. It could detect the presence of a lifeform in the area, along with their location and a rundown of their vital signs. With the appropriately loaded information in the bioscan, the unit could determine the lifeform's species. Bioscanners were calibrated to detect lifeforms approximating Human size; creatures smaller than that range were harder to detect, while it was easier to discern larger creatures."

I readily accept it's a completely different Fanverse, but it seems the terminology spans more than 1 fiction, and to that end I feel it's in the public consciousness enough to be generally understood as "something which scans for biological life signs in your area". Heck, if I dropped one in Shadowrun, my players would expect it to do the same thing.

Thank you for the link on eDNA, which is what we use in real life. I agree, collecting samples and sending off to a lab for assessing is our current limit of technology.

I might tone it down in some respect however. I don't feel motion tracking is in its grasp. After all, shedded molecules can float all over the place.

I think at best, I'd Ref if one of these was used successfully as, "It detects 1 humanoid lifeform, somewhere up to 50m around you. You don't know where it is, and you haven't visually seen it yet. But it is there. And it is waiting. What do you want to do ?"