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NCA Hematology Exam Latest Update
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NCA Hematology Exam LatestUpdate
The internationally accepted method of hemoglobin measurement requires the
conversion of hemoglobin to
A. carboxyhemoglobin
B. cyanmethemoglobin
C. oxyhemoglobin
D. sulfhemoglobin - Answer B. cyanmethemoglobin
The rule of 3 means that the
A. MCV is three times the MCH
B. RBC count is three times the Hb
C. HCT is three times the MCH
D. HCT is three times the Hb - Answer D. HCT is three times the Hb
Which of the following will result in a falsey decreased SedRate?
A. presence of codocytes
B. inflammatory reaction
C. marked anemia
D. slight tilting of the tube - Answer A. presence of codocytes
Target cells impair the rouleaux that needs to happen for proper testing to occur
153 nucleated RBCs are reported on a 100 cell diff. The uncorrected WBC count is 11.9
x 10^9/L. The corrected WBC count is
A. 3.6
B. 4.7
C. 5.2
D. 8.0 - Answer B. 4.7
,WBC = (100/100+153) x 11.9
After staining a peripheral blood smear with Wright's stain and a buffer with the correct
pH, the RBCs appear pale pink and the WBC stain very weakly with little-to-no nuclear
detail. One possible explanation is
A. the patient is experiencing diabetic alkalosis
B. the smear was stained while still wet
C. there was excessive washing of the smear
D. the slide was not on a flat surface, causing pooling of stain - Answer C. there was
excessive washing of the smear
Given the following data, calculate the manual WBC count/ uL
Dilution: 1:20
Depth: 0.1 mm
Area counted: 4mm^2
Total # counted: 120 cells
A. 600
B. 6000
C. 60000
D. 600000 - Answer B. 6000
(120x20)/0.4
Which of the following conditions would introduce a source of error into a manual WBC
count
A. uneven distribution of leukocytes in the counting chamber
B. immediate count of cells
C. a sample with an extremely low WBC count
D. using a 2% (vol/vol) solution of acetic acid as the diluting fluid - Answer A. uneven
distribution of leukocytes in the counting chamber
False-positive results may occur in the screening solubility test for hemoglobin S due to
A. decreased plasma proteins
B. hypolipidemia
, C. adding more blood to the reagent than called for by test procedure
D. a hemoglobin value <7.0 g/dL - Answer C. adding more blood to the reagent than
called for by test procedure
After a gentle inversion of tube #1 of a freshly collected CSF specimen, the specimen
appeared slightly turbid and pale yellow. After centrifugation, the supernatant was clear
and yellow. Which of the following statements is correct?
A. Methemoglobin is presnt
B. a tramatic tap has occurred
C. Free hemoglobin is present
D. pathologic bleeding occurred - Answer D. pathologic bleeding occurred
The traditional diluent of choice for quantifying spermatozoa in seminal fluid contains
A. sodium bicarbonate and formalin
B. methylene blue
C dilute acetic acid
D. normal saline - Answer A. sodium bicarbonate and formalin
The following erythrocyte indices are obtained for a specimen:
MCV: 88fL
MCH 30 pg
MCHC: 34 g/dL
These erythrocytes on a Wright-stained smear should appear
A. hypochromic, microcytic
B. normochromic, microcytic
C. normochromic, normocytic
D. hypochromic, normocytic - Answer C. normochromic, normocytic
An increase in metamyelocytes. myelocytes, and promyelocytes in the peripheral blood
can be referred to as
A. Pelger-Huet anomaly
B. a shift to the left
C. agranulocytosis
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