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A lot of medical labs still use analyzers and stuff from the '80s and only replace them when they die, so a lot of people getting healthcare might be using older tech than they think :)
Whilst I'm being cheeky, spoon and probably bowl technology remains relatively unchanged for a huge amount of time.
I guess the oldest thing I regularly use is my tractor from the '90s. I do often wish I hadn't accidentally killed my Amiga 500 as I'd likely still be gaming on that occasionally.
Only for niche and custom tests. Or maybe extremely small labs. Everything is automated and has been for many many years. The modem machines read the tube barcode, look up the patient/test, perform the test, and upload the results electronically. The only thing a tech touches is loading/unloading the tube and dealing with errors.
It may have changed more recently (or depend upon country as well), but I was still getting results from old serial/null modem devices about 10 years ago (I worked on the centralized IT side so I didn't see these devices, but this is what the on-site tech was telling me when troubleshooting things)