MLS HEMATOLOGY EXAM 2023-2024 /HEMATOLOGY
MLS ACTUAL EXAM 400 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES (VERIFIED
ANSWERS) |ALREADY
... [Show More] GRADED A+
Which of the following erythrocyte inclusions can be visualized with supravital stain but
cannot be detected on a Wright's-stained blood smear?
a. basophilic stippling
b. Heinz bodies
c. Howell-Jolly bodies
d. siderotic granules - ....ANSWER....b.
RATIONALE: Heinz bodies are irregular, refractile, purple inclusions that are not visible
with Wright's stain but show up with supravital staining. The other three inclusions can
be detected with Wright's stain
A falsely elevated Hct is obtained. Which of the following calculated values will not be
affected?
a. MCV
b. MCH
c. MCHC
d. RDW - ....ANSWER....b.
RATIONALE: the MCH = Hb x 10/RBC count and is not affected by the Hct. The MCV
= Hct x 10/RBC count, and MCHC - Hb x 100/Hct; therefore, an erroneous Hct will affect
these parameters. Centrifugal force for microhematocrit determination should be 12,000
g for 5 min in order to avoid error caused by trapped plasma. The red cell distribution
width (RDW) is calculated by electronic cell counters and reflects the variance in the
size of the red cell population. Electronic cell counters calculate Hct from the MCV and
RBC count. Therefore, the RDW would be affected by an erroneous MCV
A Miller disk is an ocular device used to facilitate counting of:
a. platelets
b. reticulocytes
c. sickle cells
d. NRBCs - ....ANSWER....b.
RATIONALE: the manual reticulocyte count involves the counting of 1,000 RBCs. The
Miller disk is a reticle (grid) that is placed in the eyepiece of the microscope and divides
the field into two squares, one being nine times larger in size than the other.
Reticulocytes are enumerated in both the squares. Mature red cells are counted in the
smaller one
RBC indicies obtained on an anemic patient are as follows: MCV 88 um3 (fL); MCH 30
pg; MCHC 34% (.340). The RBCs on the peripheral smear would appear:
a. microcytic, hypochromic
b. microcytic, normochromic
c. normocytic, normochromic
d. normocytic, hypochromic - ....ANSWER....c.
RATIONALE: the MCV, MCH, and MCHC are all within the reference interval (normal
range); hence, the erythrocytes should be of normal size and should reflect normal
concentrations of Hb. Therefore, the anemia is normocytic normochromic
All of the following factors may influence the erythrocyte sedimentation rate (ESR)
except:
a. blood drawn into a sodium citrate tube
b. anisocytosis, poikilocytosis
c. plasma proteins
d. caliber of the tube - ....ANSWER....a.
RATIONALE: EDTA and sodium citrate can be used without any effect on the eSR.
Anisocytosis and poikilocytosis may impede rouleaux formation, thus causing a low
ESR. Plasma proteins, especially fibrinogen and immunoglobulins, enhance rouleaux,
increasing the ESR. Reference ranges must be established for different caliber tubes
What staining method is used most frequently to stain and manually count
reticulocytes?
a. immunofluorescence
b. supravital staining
c. Romanowsky staining
d. cytochemical staining - ....ANSWER....b. RATIONALE:
the reticulum within the reticulocytes consi [Show Less]