Quote from mreicher
But if you're losing blood, the percentage of H & H in the remaining blood is the same, no? Let's say you have a liter of blood(making up easy numbers), 20% of which makes up your H&H. You lose 1/4 of that blood. The remaining 3/4 of the blood is still comprised of 20% H&H, no?
I get the dehydration example, but our texts lists dehydration & blood loss under fluid volume deficit & indicates that in both instances the H&H would be increased......
This is why NANDA needs to go (actually one of many reasons). Fluid volume deficit is a NANDA nursing diagnosis, which usually does more harm than good by lumping different medical conditions that have very different medical and nursing assessments and interventions into the same vague category.
In both blood loss and dehydration you will have an overall lower fluid volume, but what makes up the remaining fluid can vary. With dehydration, you are lacking in the fluid component of blood, which causes hemoconcentration and will cause the H&H to be skewed higher. Blood loss will cause a loss of whole blood, your body will then try and compensate of the loss of total volume by shifting fluid into the circulatory space which then causes hemodilution, or a relative drop in H&H.
Avoid NANDA, or at least store all NANDA related info in a part of your brain where it can't interact with information that is actually correct. Rather than fluid volume deficit, think of these two very different problems as what they are: dehydration and anemia.