I cant seem to find the answer on google. Any info would be appreciated! Thanks :)
Specializes in Critical Care.
Has 10 years experience.
Jul 1, 2014
What does hematocrit measure? If someone's hematocrit is 45%, what happens to that % if you add volume to their blood that aren't red blood cells?
Specializes in Med/Surg, Tele, Dialysis, Hospice.
Has 26 years experience.
Renal patients are chronically anemic and most of them are chronically fluid overloaded. Healthy kidneys produce erythropoietin, which stimulates the body to make red blood cells, so when you lose kidney function, you lose erythropoietin production and your body is not stimulated to make red blood cells. Increased fluid volume in the intravascular space combined with low red blood cell production = low hematocrit with fluid overload. This is the norm in dialysis patients.
Edited Jul 1, 2014 by westieluv
jadelpn, LPN, EMT-B
Think about fluid being a dilutant.
Hemoglobin and Hematocrit - Clinical Methods - NCBI Bookshelf
Thanks for your responses, sorry I should have included more info. The patient does not have kidney disease, his low hgb and hct are suspected result of GI bleed. Therefore if he has a GI bleed I would think he'd be volume down?
meanmaryjean, DNP, RN
Specializes in NICU, ICU, PICU, Academia.
Has 40 years experience.
Unless he's gotten volume replacement in the form of IV fluids which do not contain cells.
HouTx, BSN, MSN, EdD
Specializes in Critical Care, Education.
Has 35 years experience.
It's not unusual for severely anemic patients to be fluid over-loaded & 3rd spacing due to compensatory mechanisms... chemical and baro-receptors kick in trying to increase volume by any means possible. 3rd spacing due to osmotic pressures as intravascular fluid becomes more diluted.
So - low H&H is due to acute bleeding - volumes will be low also. But as homeostatic compensatory mechanisms kick in & enthusiastic fluid resuscitation gets underway, things can easily go awry.
I'll tell you something that goes along with that kind of deal too--you can be fluid overloaded and dehydrated at the same time!
Here.I.Stand, BSN, RN
Specializes in SICU, trauma, neuro.
Has 16 years experience.
He could have been volume depleted from the blood loss, but then what happens to the BP? BP and CVP's down, let's fill up the tank! Give a liter NS, another liter NS, another liter NS... what has then happened to the fluid:blood cell ratio?
Also, keep in mind that we tolerate lower hgb's than we used to before transfusing. So just because someone has low BP because of hypovolemia, they're not necessarily going to replace that volume w/ PRBCs. A hgb of 8 while yes anemic, is not low enough to warrant a blood transfusion in most cases. So then they would treat the hypovolemia w/ fluids like I mentioned ^^^
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