Q. Immediately after an acute episode of blood loss – following a motor vehicle accident, for example – the hemoglobin level is normal. Why is that? Are the other red cell indices normal too?
A. Immediately after acute blood loss, all the laboratory red cell indices are normal! The hemoglobin, RDW, RBC, MCH, and the MCHC are all normal. Because really, although the patient has lost blood (and therefore is in trouble because he/she has fewer red cells to transport oxygen through the body), the blood that’s examined in the laboratory appears totally normal! It has the same number of red cells per unit volume, and the red cells themselves are perfectly normal (assuming the patient’s blood was normal to begin with). This is because during acute blood loss, you’re losing red cells but also the plasma that goes along with them. So the blood remaining in the patient is totally normal – it’s just that there isn’t enough of it.
- Kristine said Glad it helped!!
- Sam said This is great. Thank you so much for taking the time to explain these concepts!
- Kristine said Thanks so much, Mukarram! So glad you like the site
- Mukarram said I searched Google for “bacteria that cause bloody diarrhea” and got pretty excited when...
- peter nkhata said good work
- Kristine said It is a very rare blood group in which patients do not have the H gene (which encodes an enzyme that...
- Hafiz said Hi Dr Kristine, I am Hafiz from Malaysia. I am a master in haematopathology course, do you have list...
- soraya said Thanks,very good
- Bijita Dutta said Thanks a lot, it’s really a very nice explanation. .
- SANDHYA said Tanx Kristine !
- Dr Mansingh Jain said What is Bombay blood group
- Tanmoy Ganguly said Thanks doctor..very useful information..