HEME CLINICAL EXAM 1 QUESTIONS AND
ANSWERS
Which of the following is responsible for the most serious laboratory errors?
Misidentifying the patient
Indicate the correct order that blood should be drawn by placing 1, 2, 3, or 4
after the appropriate item:
Blood culture, plain tube, coag, purple top
Forcing blood drawn in a syringe into a lavender tube could result in:
Hemolysis
Of the following tubes, which colour is acceptable for testing if the blood is
clotted?
Red
Of the following tubes, which colour is acceptable for testing if the blood is
clotted?
Red
Where on a manual smear will larger cells such as blasts be found?
Feathered edge
Which condition is most likely on a patient with a WBC of 25,000/HL, platelet
count of 11,000/uL, and a left shift including several blasts.
Acute leukaemia
If a PTT was performed on serum instead of plasma, the result would be:
Higher than plasma
Which of the following is an acceptable site for blood collection?
Below a cast
A specimen from a difficult draw has flags for decreased RBC count, decreased
hematocrit, and an increased hemoglobin. What should be suspected?
Hemolyzed specimen
In the above question, what is the best remedy?
Request new sample
An automated cell counter prints a WBC of 220,000/uL. What other parameters
will affected?
Hgb hct and rbc
Plt formula for hemocytometer
Plt count X dilution aX 10
All nine squares hemocytometer formula
, Ave of cells X 2 X
Percent of lymph's that are B cells
10
A cell counter prints a platelet count of 36 X103/uL. The manual smear has
platelet clumps. What should be done?
Vortex then redraw
When preparing a cytospin smear, which of the following preserves the cells
and keeps them intact as they are deposited onto the slide is:
Albumin
Severe lipemia interferes with all of the following EXCEPT:
HCT
Will an individual living at high altitudes have a higher or lower hematocrit
than living at sea level(A)?
It would be higher
Will an individual living at high altitudes have a higher or lower hematocrit
than living at sea level Why(B)?
Lower O2 tension @high altitude will stimulate kidneys to excrete more
erythropoieten and increses rbc production
Describe A) the cause of water artifact on a stained blood smear, B) what it
resembles on the blood smear, and C) how to prevent the formation.
Caused by not drying, looks hypochromic , allow to dry longer or fix with
methanol
What is the most common reason for platelet clumps?
Not mixing the tubes or waiting too long to mix. Fingersticks clump in general
Why is it important to centrifuge coagulation tests for a certain time and speed
To remove the platelets from the plasma bc they activate the coag cascade
Reference ranges for the lab in which you are interning. WBC:
4000-11000
Reference ranges for the lab in which you are interning. HGB Adult:
Male 14-18 female 12-15
Reference ranges for the lab in which you are interning. HGB
Infant : 16-22 toddler 9.5-15
Reference ranges for the lab in which you are interning. MCV: Adult:
80-100
Reference ranges for the lab in which you are interning. MCV: Infant:
95-125
Reference ranges for the lab in which you are interning. PLT:
150000-450000
ANSWERS
Which of the following is responsible for the most serious laboratory errors?
Misidentifying the patient
Indicate the correct order that blood should be drawn by placing 1, 2, 3, or 4
after the appropriate item:
Blood culture, plain tube, coag, purple top
Forcing blood drawn in a syringe into a lavender tube could result in:
Hemolysis
Of the following tubes, which colour is acceptable for testing if the blood is
clotted?
Red
Of the following tubes, which colour is acceptable for testing if the blood is
clotted?
Red
Where on a manual smear will larger cells such as blasts be found?
Feathered edge
Which condition is most likely on a patient with a WBC of 25,000/HL, platelet
count of 11,000/uL, and a left shift including several blasts.
Acute leukaemia
If a PTT was performed on serum instead of plasma, the result would be:
Higher than plasma
Which of the following is an acceptable site for blood collection?
Below a cast
A specimen from a difficult draw has flags for decreased RBC count, decreased
hematocrit, and an increased hemoglobin. What should be suspected?
Hemolyzed specimen
In the above question, what is the best remedy?
Request new sample
An automated cell counter prints a WBC of 220,000/uL. What other parameters
will affected?
Hgb hct and rbc
Plt formula for hemocytometer
Plt count X dilution aX 10
All nine squares hemocytometer formula
, Ave of cells X 2 X
Percent of lymph's that are B cells
10
A cell counter prints a platelet count of 36 X103/uL. The manual smear has
platelet clumps. What should be done?
Vortex then redraw
When preparing a cytospin smear, which of the following preserves the cells
and keeps them intact as they are deposited onto the slide is:
Albumin
Severe lipemia interferes with all of the following EXCEPT:
HCT
Will an individual living at high altitudes have a higher or lower hematocrit
than living at sea level(A)?
It would be higher
Will an individual living at high altitudes have a higher or lower hematocrit
than living at sea level Why(B)?
Lower O2 tension @high altitude will stimulate kidneys to excrete more
erythropoieten and increses rbc production
Describe A) the cause of water artifact on a stained blood smear, B) what it
resembles on the blood smear, and C) how to prevent the formation.
Caused by not drying, looks hypochromic , allow to dry longer or fix with
methanol
What is the most common reason for platelet clumps?
Not mixing the tubes or waiting too long to mix. Fingersticks clump in general
Why is it important to centrifuge coagulation tests for a certain time and speed
To remove the platelets from the plasma bc they activate the coag cascade
Reference ranges for the lab in which you are interning. WBC:
4000-11000
Reference ranges for the lab in which you are interning. HGB Adult:
Male 14-18 female 12-15
Reference ranges for the lab in which you are interning. HGB
Infant : 16-22 toddler 9.5-15
Reference ranges for the lab in which you are interning. MCV: Adult:
80-100
Reference ranges for the lab in which you are interning. MCV: Infant:
95-125
Reference ranges for the lab in which you are interning. PLT:
150000-450000
