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let's just say, I've seen hemoglobin counts as low as 3.1 in a living person -- granted that person was hanging on ... but what makes a hemoglobin, or for that matter, a hematocrit dangerous is the velocity of change ... beyond the pure absolute number, the change in number makes a huge difference ...

patients/people who have rapid changes in H/H's are more likely to be symptomatic because the body has less time to adapt to a low H/H and decreased blood oxygen content, but surprisingly, if a patient/person's H/H drops very slowly the body learns to accomodate ... for every person, there is an absolute low H/H(and for that matter a velocity change in H/H) after which the patient cannot tolerate the blood counts and will manifest with symptoms, those numbers is completely dependent on a patient's underlying medical health(e.g those with heart disease/lung disease are more suspectible to anemia) -- this "dangerous" level has the same principles .. what's dangerous to some may be readily tolerable to others ... an older patient with severe heart disease may have a heart attack with a hemoglobin of 9, while a young 18 y/o male without any health issue may easily tolerate a hgb of 4 ...





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