One concrete data point for the thread. Keep the original post as written when you update it, and add the correction underneath. An edited-away mistake is invisible to the next person who makes it.

I would rather be corrected than agreed with, if it comes to it.

One thing that is still open after andrew_nyc’s answer:

Did your prescriber agree with that reading, and if not what was their objection?

DanielChem_CHI said:

Keep the original post as written when you update it, and add the correction underneath.

Pushing back on DanielChem_CHI here. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.

DanielChem_CHI said:

Keep the original post as written when you update it, and add the correction underneath.

No disagreement, though the timescale matters more than the mechanism here. Most of what looks like a difference in kind turns out to be a difference in how long somebody waited.

DanielChem_CHI said:

Keep the original post as written when you update it, and add the correction underneath.

That reframing is the part I needed.