Strangely my spo2 values drop to 83 for a minute while walking I had no symptoms during that time and i kept walking and checked it again after 2 minutes it was back to 98 and i walked again for more than 10 minutes and it was 97-98. Also 1 month back I had routine chest x ray and all necessary heart tests which were normal. And I have been fasting since morning and after breaking my fast i went for a walk so will dehydration have affected the spo2 for a short time?. My spo2 level was always between 97-99 today was the first time it was 83 for a couple of minutes .