G'morning , and thanks for your post and question - it's a good one! Generally speaking, pulse oximeters give an accurate representation of one's oxygen saturation. Typically, these are the types of oximeters used in the hospital and the home care settings. Professionally and personally speaking, the finger tip oximeters are preferred over the
wrist-style oximeters. I do believe the medical literature supports this view as well.
All the best,
Leon L (author / site moderator)