Dr.BariatricHTX said:

Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the…

This matches mine closely enough to be worth saying so out loud.

OP back with an update, since a thread like this is useless without one.

Late follow-up. I did not do what was suggested, I did something adjacent, and it worked; posting the difference in case it matters to somebody.

Adding the numbers, since they settle part of this. 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.

One thing that is still open after Dr.BariatricHTX’s answer:

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

Old thread, but it comes up first when you search for this, so it is worth updating. If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way. Most of the apparent contradictions in these threads dissolve at that step.

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