We went to the doctor today. They didn't draw blood for lab work like we expected but they tested Tandra's breathing and O2 levels. With the O2 flowing at 6 liters per hour which is what it's been since she came home from the hospital, her blood O2 levels were very good (97%). They brought the O2 flow down to 3 lph and her O2 was still good (95%). They got her up and walked her around on 3 lph and her O2 never dropped below 92%, so he brought her down to 3 permanently. This is a good thing - it seems that her breathing is improving somewhat, which suggests the chemo might be working.