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How is the Mean Cell Volume calculated?
A) (Hemoglobin/RBCs) x 10
B) (Hemoglobin/ RBCs) x 100
C) (Hematocrit %/ RBCs) x 10
D) (Hematocrit % / Hemoglobin) x 100
C) (Hematocrit %/ RBCs) x 10
The Mean Cell Volume, or MCV, can be calculated by dividing the hematocrit (%) by the red
blood cell count and multiplying by 10. The MCV describes the volume, or size, of the red blood
cell population.
The Mean Cell Hemoglobin, or the MCH, can be calculated by dividing the hemoglobin (g/dL)
by the red blood cell count and multiplying by 10. The MCH represents the average weight of
hemoglobin in red blood cells.
The Mean Cell Hemoglobin Concentration, or the MCHC can be calculated by dividing the
hemoglobin (g/dL) by the hematocrit (%) and multiplying by 100. The MCHC is the ratio of
hemoglobin mass to volume of RBCs.
Which of the following is characteristic of an exudate effusion?
A) Leukocyte count greater than 1,000 WBC/microliter
B) Clear appearance
,C) Protein concentration less than 3.0g/dL
D) Absence of fibrinogen
A) Leukocyte count greater than 1,000 WBC/microliter
Effusion is the increase of fluid between the serous membranes due to disruption of the
mechanisms of formation and reabsorption of serous fluid. Exudates are caused by conditions
affecting the particular cavity such as infections and malignancies.
Exudate effusion characteristics include:
,- Leukocyte count greater than 1,000WBC/microliters
- Fluid: Serum Protein ratio >0.5
- Yellow or cloudy appearance
- Possible spontaneous clotting
Which bacterial species is most likely represented by the spreading, gray-white, beta-hemolytic
colonies with a "frosted glass" appearance as illustrated in the photograph?
A) Burkholderia pseudomallei
B) Listeria monocytogenes
C) Bacillus cereus
D) Streptomyces anulatus
C) Bacillus cereus
Bacillus cereus colonies are characteristically spreading gray-white, and beta hemolytic with
"frosted glass" appearance.
Burkholderia pseudomallei also produces spreading colonies, but they are more wrinkled in
appearance and without beta hemolysis
Listeria monocytogenes produces small, round, translucent colonies that characteristically have a
narrow zone of beta hemolysis, noted if colonies are removed.
The nocardioform bacteria Streptomyces (formerly gresus) anulatus produces opaque, chalky,
white colonies, This species can also be suspected if the colonies have a pungent, musty
basement odor.
The element that is indicated by the arrow is a:
A) Red blood cell cast
B) Granular cast
C) Hyaline cast
D) Renal tubular epithelial cast
A) Red blood cell cast
This is a red blood cell cast. RBCs can be identified within the matrix of the cast. The
identification of the cast as a red blood cell cast is supported by the appearance of RBCs outside
of the cast.
Granular casts are composed of plasma protein aggregates and cellular remnants. Their presence
in the urine may be of pathologic or onpathologic significane. Granular casts appear as coarse or
fine granules in cast matrix.
, Hyaline bcats bgenerally bappear bcolorless, bhomogeneous, band btransparent bwith brounded bends.
bThey bcan balso bbe bseen bas ba bresult bof bdehydration, bafter bdiuretic btherapy, bin brenal bdisease, band
btransiently bas ba bresult bof bexercise.
Renal btubular bepithelial b(RTE) bcasts bare bcause bby bthe bsloughing bof bnecrotic brenal btubular bcells
bdue bto badvance btubular bdestruction. bRTE bcells bare busually bseen bas ba bpart bof bthe bcast.
A bmean bvalue bof b100 bmg/dL band ba bstandard bdeviation b1.8mg/dL bwere bobtained bfrom ba bset bof
bglucose bmeasurements bon ba bcontrol bsolution. bBased bon b95% bconfidence binterval b(in bmg/dL),
bwhat bwould bbe bthe bcalculated b2 bSD bupper band blower blimits bfor bthis bcontrol?
A) 94.6 bto b105.4
B) 96.4 bto b103.6
C) 97.3 bto b102.7
D) 98.2 bto b101.8
B) 96.4 bto b103.6
The b95% bconfidence binterval bcan balso bbe bdescribed bas bthe bprobability bthat b95% bof bthe btime, bthe
bquality bcontrol bwill bfall bwithin b+/- b2 bstandard bdeviation bof bthe bmean. bIn bthis bcase, b2 bstandard
bdeviations bwould bbe bcalculated bas b1.8mg/dL bmultiplied bby b2 bwhich bequals b3.6mg/dL.
Therefore, bthe bcalculated b2SD b(3.6mg/dL bplus band bminus bthe bmean) bbased bon bthe b95%
bconfidence binterval bwould bbe b96.4 b- b103.6.
Which bof bthe bfollowing bsources bof berror bwill bgive ba bfalse bnegative bresult bin bantihuman bglobulin
btesting?
A) Low bpH bof bsaline
B) Dirty bglassware
C) Samples bcollected bin bgel bseparator btubes
D) Refrigerated bspecimen
C) Samples bcollected bin bgel bseparator btubes
A blow bpH bof bsaline bis bindicated bas ba bfalse bnegative bsource bof berror bin bantihuman bglobulin
btesting.
Dirty bglassware, bsamples bcollected bin bgel bseparator btubes, band brefrigerated bspecimens bare ball
bindicated bas bfalse bpositive bsources bof berror bin bantihuman bglobulin btesting.
Lymphocyte bpleocytosis brefers bto ba(n) b in ba bCSF bwhen bcompared bto ba bnormal bshape.
A) Increased bnumber bof blymphocytes
B) Decreased bnumber bof blymphocytes