We can get very scientific here, but why?
Oxygen is cheap--get a pulseox and use it ia few times, then spot check.
Sometimes the flowmeters are "off" a bit.
If you must conserve, due to lack of supply, then aim for a pO2 of greater
than 90.
If it is necessary to conserve often, then get a bigger supply, or be more
efficient, such as a EDS (medical equivalent is a CPAP)--
Hartley Falbaum

"Shawn" wrote in message
. ..
Udo wrote:
How long does it take for the blood oxygen level to normalize at 15000
ft, after one discovers the flow meter was not adjusted correctly?

Seconds really if you start sufficient flow. The body is good at getting
O2 into the blood. However side effects may linger (e.g. headache).

Also at what altitude does Oxygen become beneficial, assuming an
average person?

Average? A 55 kg 26 year old female who walks 10 miles every day would be
a good baseline for an average healthy human YMMV :-)
*Your* best bet is to buy a pulse oximeter (e.g. Nonin 9500) available for
less than 200 USD these days, check your resting pO2, then go fly. Go on
O2 and titrate it accordingly to maintain that normal oxygen level.

Are there any factors, other then altitude it self,
that can lower Blood oxygen level during flight assuming supplemental
oxygen is not used between 5000 and 10000 ft and the pilot has a normal
cardio vascular health? What oxygen level is considered optimum at sea
level and 10000ft to 15000ft?

As altitude increases, the kidneys dump water (altitude diuresis). The
problems associated with dehydration are being discussed (or ignored) in
other threads, so avoid one cause of the problem and keep the O2 on.
As for what level of saturation is optimum, why let it drop any below
normal resting?


Shawn