Critical Values

Question 1

Hct

Answer 1

<21% or <0.21

>65% or >0.65

Question 2

Hgb

Answer 2

<70 g/L

>200 g/L

Question 3

Reticulocyte

Answer 3

> 20%

Question 4

WBC count

Answer 4

<2000/uL on a new px or a 1000/uL difference from previous, if less than 4000/uL
>50000/uL on a new patient

Question 5

Blood smear

Answer 5

neutrophilic phagocytosis of microorganisms (SI)
abnormal leukemoid reax
schistocytes (hemolysis)
sickle cells
blast forms (if not recently reported in the px)
presence of intracellular organisms

Question 6

Platelets

Answer 6

<20000/uL not previously reported

>1 million/uL

Question 7

Prothrombin time

Answer 7

> 40 seconds