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HEME QUESTIONS AND ANSWERS LATEST UPDATED
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HEME QUESTIONS AND ANSWERS LATESTUPDATED
The erythrocyte sedimentation rate (ESR) is: - ANSWER increased in
inflammatory diseases
Which of the following stages occurs in the sedimentation of RBCs? -
ANSWER all of the above
What causes rouleux formation of RBC's? - ANSWER proteins coating
the RBCs and decreasing the zeta potential
What is the effect of rouleaux formation on an ESR? - ANSWER
increasing the ESR by reducing the surface area of the RBC
Which of the following clinical conditions will cause an elevated ESR? -
ANSWER All of the above
Which type of microscopy is used for manual platelet counts? -
ANSWER phase
What type of microscope is used for differentials? - ANSWER bright field
What do you do if significant numbers of platelet clumps are seen on a
smear? - ANSWER do not report the platelet count and the WBC count
If peripheral blood smears are too thin, you should: - ANSWER increase
the angle of the spreader slide
What effect would the use of a buffer with a pH of 6.0 have on a Wright
stained smear? - ANSWER RBC's would be too pink
The Coulter principle of cell counting is based upon the fact that: -
ANSWER isotonic solutions conduct electricity better than cells do
, Which of the following best describes the Coulter principle of cell
counting and sizing? - ANSWER Electrical impedance
Another term that best describes the optical scatter principle of cell
counting and sizing is: - ANSWER Flow cytometry
Which scatterplots and histograms generated from automated
hematology instruments are used to determine the automated
differential? - ANSWER WBC
Which method is mostly used on automated hematology instruments for
a HGB determination? - ANSWER Cyanmethemoglobin method
An increased RDW should correlate with: - ANSWER anisocytosis
Which of the following statistical terms reflects the best index of
precision? - ANSWER coefficient of variation
What parameters are directly measured in automated hematology
instruments? - ANSWER WBC, RBC, HGB, PTC
What stain is used to determine reticulocytes on automated hematology
instruments? - ANSWER Supravital stain
The following patient results are obtained on an automated hematology
instrument:
MCV = 75fL
RDW = 20%
Based on these parameters, what RBC morphology would one expect to
find on the peripheral blood smear? - ANSWER microcytic cells with
significant variation in size
RBC agglutination will cause falsely elevate: - ANSWER MCV
An aid for dealing with RBC agglutination in a laboratory specimen is to:
- ANSWER warm the specimen
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