that exactly matches my experience: the second most renowned academic hospital of a similar western country... but I wonder what the doctor commented on these results?
No comment yet. They have an online system for patients to access test results. They went up at the beginning of last week, then the country effectively had a 4-day weekend

But wouldn't the PO2 support the low oxygen saturation, or are those generally unrelated? I haven't really looked into the PO2 much yet.
that does not sound good. isnt that a very long time after the exertion?. To state my level of knowledge clearly, I am by no means any expert of lactate metabolism, in particular I do not know the natural curve after exertion nor the normal diurnal curve.
Yes, I did look into lactate after my Adventures With Metformin. It's normal for it to go over the range given (that's the rested range). But it should peak about 5 minutes after exertion, then steadily drop over the next hour or so. I did a
4 minute step test at home (heart rate 140-145 for last three minutes), and mine didn't go particularly high, but it also didn't drop, and continued peaking for 2 hours.
This is a normal lactate curve:
This is my lactate:
So I think my lactate level shortly after the stair-climbing at the hospital was probably pretty normal, though possibly not for the level of exercise involved. The evening results aren't expected to be any higher from what I've read, though there isn't a lot of information online. I downloaded some medical books recently, so maybe those will have have some more concise answers.
nor do I know if you have eaten or had further exertion by going home. but back when I had cfs (is that your issue?) many doctors tested me for lactate.
I had dinner around 7pm, but no exertion after the stair climbing. We had my wheelchair at the hospital. It was a fairly bad day, however, even before leaving home. I started out with tachycardia pretty early, which usually means my pulse pressure is low.
What could be, however, interesting: while I never had pathologically elevated lactate, I could lower my post-exercise lactate levels by breathing exercises.
Altering my breathing tends to make me feel worse. It can help a bit if I temporarily breath deeper and faster, but it's too exhausting to do for long.
then, what is your normal spo2, w/o holding breath?
99%. At 97% my body seems to freak out and my heart rate rises until it's back to 99%.
have you tried increasing potassium? you seem to have room for improvement
My gut doesn't like electrolyte mixes, unless I use them very rarely. Disappointing, since they did seem to help with OI a bit.