NCA HEMATOLOGY EXAM NEWEST 2024 ACTUAL TEST BANK QUESTIONS WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
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Course
NCA HEMATOLOGY
Institution
NCA HEMATOLOGY
NCA HEMATOLOGY EXAM NEWEST 2024 ACTUAL TEST BANK QUESTIONS WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
As the supervisory clinical lab scientist, you are asked to review a Wright-stained peripheral blood smear that shows clumping of leukocytes and platelets. Which of the following is the...
NCA HEMATOLOGY EXAM NEWEST
2024 ACTUAL TEST BANK QUESTIONS
WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS
As the supervisory clinical lab scientist, you are asked to review a Wright-stained
peripheral blood smear that shows clumping of leukocytes and platelets. Which of the
following is the most probable cause for these morphologic changes?
A. smear was made from 1 hr old heparinized blood
B. smear was made from 1 hr old EDTA blood
C. excessive pressure was applied when making the smear from blood in the tip of a
venipuncture needle
D. smear was made using fresh capillary blood - Answer-A. smear was made from 1 hr
old heparinized blood
An EDTA-anticoagulated tube is received in the lab only particaly filled, causing
excessive concentration of EDTA. Since the patient was undergoing an MRI and would
not be available to provide another specimen for an hour, the physician requested that
the lab perform any test that would be reliable. Which of the following procedures would
be accurate on this sample?
A. platelet count
B. Hb
C. peripheral blood smear
D. spun Hct - Answer-B. Hb
Which of the following is appropriate in preparing an EDTA-anticoagulated specimen for
analysis when it was been standing in a rack and not on a mechanical rotator?
A. shake vigorously by hand
B. Invert gently at least 60 times
C. mix for a minimum of 2 min using a vortex mixer
D. invert 4-6 times - Answer-B. Invert gently at least 60 times
A patient has a hematocrit of 15%. In order to obtain an acceptable wedge peripheral-
blood smear, the clinical lab scientist should make the following adjustment
A. use a hemocytometer cover glass as the spreader slide
B. push the spreader slide 50% slower than usual
C. permit some of the blood to get in front of the spreader slide
D. Increase the angle of the spreader slide greater than 45 degrees - Answer-D.
Increase the angle of the spreader slide greater than 45 degrees
,When performing a manual differential on a Wright-stained blood smear, the CLS noted
purplish black precipitate over the slide. One cause of this precipitate is
A. precipitation of paraproteins from the patient's blood
B. insufficient rinsing of the stain and buffer mixture
C. insufficient aging of the Wright's stain before use
D. failure to remove stain from the back of the slide - Answer-B. insufficient rinsing of
the stain and buffer mixture
Am automated plt count performed on a venous blood specimen collected in EDTA is
40. The CLS notes platelet clumps on the Wright-stained blood smear. The CLS should
A. perform a manual plt count using the same specimen
B. redraw the specimen in sodium oxalate and repeat the count
C. redraw the specimen in sodium citrate and repeat the count
D. inform the physician that an accurate plt count cannot be obtained on the patient -
Answer-C. redraw the specimen in sodium citrate and repeat the count
A patient who underwent a bone-marrow transplant had daily leukocyte counts
performed. Lab policy required that counts below 2.0 be performed manually. Since the
transplant patients usually have decreased count, the lab scientist prepared a standard
WBC Unopette result in a 1:20 dilution. 84 leukocytes were counted in the entire area
on both sides of the Neubauer hemocytometer. How should the count be reported?
A. 0.4
B. 0.8
C. 0.9
D. 1.9 - Answer-C. 0.9
(84/(18x0.1))x20 = 933 cells/mm^3 = 0.9 x 10^9/L
A new CLS in a hematology/oncology clinic consistently reads microhematocrit-control
and patient causes higher than co-workers do. Which of the following actions of the CLS
could explain this discrepancy?
A. Buffy coat is not being included
B. time of centrifugation is too long
C. speed of centrifugation is too high
D. microhematocrit tubes are allowed to sit and are not read within a few minutes of
centrifugation - Answer-D. microhematocrit tubes are allowed to sit and are not read
within a few minutes of centrifugation
An EDTA specimen from a known sickle-cell anemia patient is received fro a
microhematocrit and hemoglobin determination using the cyanmethemoglobin principle.
Values obtained are hemoglobin of 10.7 and a hematocrit of 22%. The CLS should
A. centrifuge the hemoglobin and read the supernatant as the test sample
B. mix the hemoglobin dilution 1:2 with distilled water, then read and multiply the results
by 2
C. repeat the hematocrit using heparinized hematocrit tubes
, D. repeat the procedure and, if similar results are obtained, report them immediately -
Answer-B. mix the hemoglobin dilution 1:2 with distilled water, then read and multiply
the results by 2
A Hb value of 12.5 best correlates with a Hct value of
A. 25.3%
B. 33.5%
C. 37.5%
D. 42.8% - Answer-C. 37.5%
A patient has an RBC count of 2.70, a Hb of 5.5, and a hematocrit of 19%. What
erythrocyte morphology would you expect to see on the peripheral blood smear?
A. microcytic, hypochromic
B. macrocytic, hypochromic
C. normocytic, hyperchromic
D. normocytic, normochromic - Answer-A. microcytic, hypochromic
MCV= 19x10/2.70 = 70.3
MCHC = 5.5/19 x100 = 28.9
When reviewing a peripheral blood smear, the CLS notes many macrocytes. The MCV
has been reported as 85fL. This apparent discrepancy may indicate
A. the smear was made from the wrong sample
B. the smear should be closely checked for spherocytes
C. the patient may have a hemolytic anemia
D. cold agglutinins may be present - Answer-A. the smear was made from the wrong
sample
In the performance of a modifed ESR, what is the recommended dilution?
A. 1:2
B. 1:3
C. 1:4
D. 1:5 - Answer-D. 1:5
A miller disc is uded to perform retic counts. After counting 500 RBCs in square B, a
total of 40 retics are seen in square A. How should the retic count be reported? (A =
1/9B)
A. 0.1%
B. 0.9%
C. 4.4%
D. 8.0% - Answer-B. 0.9%
(40/(500x9))x100
Given the following results on a male patient, calculate the retic production index (RPI)
RBC: 2.8
Hb: 9.0
Hct: 29%
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