Hematocrit Flashcards
Units of hematocrit
% & L/L
Other term for hematocrit
Packed cell volume (PCV)
Define hematocrit
It refers to the RBCs that have settled & the ratio of the volume of packed RBCs to the volume of whole blood
What is the normal ratio for Hct?
50%
How long is the microhematocrit tube?
75mm
How much blood can the micro-Hct tube hold?
0.05mL
Inner bore and plug of micro-Hct
1.2mm; 4-6mm
2 types of bands in micro-Hct
Red & blue band
T/F: red band: skin puncture
blue band: EDTA tube
TRUE
This seals the end of the tube w/ the colored ring
Non-absorbent clay
T/F: Buffy coat should not be included in the reading
TRUE
T/F: values of the duplicate hct should not agree within 1%
FALSE; values of the duplicate SHOULD AGREE w/in 1%
Conditions that can cause trapping of plasma in the RBC layer
- Sickle cell anemia
- Macrocytic anemia
- Hypochromic anemia
- Spherocytosis
- Thalassemia
T/F: 1%-3% higher than the value obtained is affected by trapped plasma
FALSE; it is NOT affected by trapped plasma
Precalibrated capillary tube that has a built in hct scales
Readacrit centrifuge
Factory inserted plugs
Sureprep capillary tubes
This ensures accuracy of Hb & Hct test results
Rule of 3
It is applied for a quick visual check of automated results of Hb & Hct
Rule of 3
T/F: Rule of 3 only applies to specimens with normocytic & normochromic RBCs
TRUE
Duplicate micro-Hct determinations should be made using fresh, well-mixed blood anticoagulated with what?
EDTA
How many specimens should be used?
2
At what intervals does the centrifuge duplicates?
30 second interval
What is achieved when the hct has remained at the same value for 2 consecutive readings?
Optimum packing
