My question is: does being anemic cause the o2sat to lower?I have asked 2 teachers this and both have responded differently. One said yes and one said not usually if the body is compensating. I know that o2sat is measuring the amount of oxygen in the blood - SO shouldnt that mean if a patient is anemic since they have less blood in their system there will be less oxygen? Or is it only measuring the oxygen carrying capacity in the blood that is still THERE? I had a patient who was severely iron deficiency anemic. she had ulcerative colitis and had been losing blood in the stool for 5-6 months before she was admitted. her nail beds and palms were white and she complained of swollen ankles, headaches upon walking up stairs, and blurred vision like a strobe light in the final days. her hct was 15 and hemoglobin was 4. however, her o2sat was normal..... especially since this was iron deficient- and iron carries oxygen- shouldnt the o2 sat have been affected at all? or was her body compensating since it was chronic loss over a very long period of time? Also, would this low hct and hgb cause clubbing of fingers like in COPD?