ASCP MLS Hematology
Insufficient centrifugation will result
in:
A. A false increase in hematocrit
(Hct) value
B. A false decrease in Hct value
C. No effect on Hct value
✅✅
D. All of these options, depending
on the patient - -A. Insufficient
centrifugation does not pack down
the
red blood cells; therefore, the Hct,
which is the
volume of packed cells, will
increase.
,Variation in red cell size observed
on the peripheral smear is
described as:
A. Anisocytosis
B. Hypochromia
✅✅
C. Poikilocytosis
D. Pleocytosis - -A. A mature
erythrocyte is approximately 7-8 μm
in
diameter. Variation in normal size is
denoted by the
term anisocytosis. Hypochromia is a
term that indicates increased central
pallor in erythrocytes, and
poikilocytosis denotes variation in
red cell shape.
,Which of the following is the
preferable site for bone marrow
aspiration and biopsy in an adult?
A. Iliac crest
B. Sternum
C. Tibia
✅✅
D. Spinous processes of a vertebra
- -A. The iliac crest is the most
frequently used site for
bone marrow aspiration and biopsy.
This site is the
safest and most easily accessible,
with the bone just
beneath the skin, and neither blood
vessels nor
, nerves are in the vicinity.
Mean cell volume (MCV) is
calculated using the following
formula:
A. (Hgb / RBC) × 10
B. (Hct / RBC) × 10
✅✅
C. (Hct / Hgb) × 100
D. (Hgb / RBC) × 100 - -B.
MCV is the average "volume" of the
red cells. This is
obtained by dividing the Hct or
packed cell volume
(PCV) by the red blood cell (RBC)
count in millions per
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