CBC Flashcards
What cells increase with hemoconcentration (dehydration)?
RBC, WBC, Platlets
What is the neutrophil (seg) to lymphocyte (lymph) ratio?
60:40; Reverse ratio = lymphocytosis
Can the neutrophil (seg) be elevated with a normal WBC?
Yes. It can still mean infection.
What happens in a “left shift?”
> 5 bands (immature WBC) can occur with increased, normal or decreased WBC and indicate infection
What is leukocytosis?
WBC count over 11,000 mm3
What do you suspect if WBC count is greater than 30,000 mm3 with lymphadenopathy?
Leukemia or Lymphoma
How high can stress increase WBC?
20,000-25,000 mm3; need to recheck in 24 hours; more common in children
Lymphocytosis plus anemia, thrombocytopenia, or neutropenia suggests what?
Cancer; refer to Hematologist
Leukopenia is a WBC count of what?
<4,000 mm3
If you have a decreased WBC with increased lymphocytes, what are you looking for?
Viral infection or pertussis
What do you assume with a patient that has neutropenia and any fever >100.4 without a clear cause?
Assume infection (sepsis) until proven otherwise. This is a medical emergency.
What diagnosis are you looking for with Eosinophilia?
Consider allergies or helminth parasitic infection
What much larger is the Hct compared to the Hgb?
Hgb x 3= Hct; if not consider a lab error
With chronic renal failure, what do you expect the Hgb/Hct ratio to be?
About 10/30; if normal or lower there could be an additional problem (dehydration)
What does MCV tell you?
The size of the RBC
