WBC Special Quiz

How many drops of blood required in a spinner method?

• 2 - 4

• 3 - 5

• both

• neither

Which of the following sample is best for making a peripheral blood smear?

• a drop of capillary blood

• fresh EDTA sample

• EDTA sample collected 3 hours ago

• AOTC

ALL are characteristics of a good blood film except:

• Should occupy 2/3 of the total slide area

• Smooth without holes, irregularities or streaks

• gradual transition from thin to thick area

• NOTC

A true Rouleaux is found in which area of the blood smear?

• thick

• thin

• between the thick and the thin

• all areas

Which of the following may cause the presence of holes in the blood film?

• fat or oil in the slide

• chipped spreader

• water contaminated fixative

• pathological cause

Which of the following can correct the presence of RBC clumps in the blood smear?

• no way to correct this

• clean the slide

• incubate the sample and remake the smear

• mix the blood sample well before making the smear

polychroming means

• aging

• ripening

• both

• neither

Possible cause

• humidity in the air

• water contaminant on the fixative

• both

• neither

All are ways to avoid precipitation artifacts except?

• immerse the slide in the stain

• flood the smear with the stain

• change the stain frequently

• follow proper timing of staining

For the blood smear, the ideal pH of the buffer should be:

• 6.8

• 7.2

• 6.4

• 7.5