MLS EXAM QUESTIONS AND ANSWER;
LATEST UPDATED VERSION 2026
A biomarker with a high specificity: - correct answer-
accurately detects the absence of disease and has few false-
positives
A biomarker with high sensitivity: - correct answer-
accurately identifies the presence of disease and hos few false-
negatives
A hapten is only antigenic when it is coupled with which of the
following: - correct answer- Proteins
A mojor action of angiotensin II is: - correct answer-
increased vasocontriction
A patient experiences a mild allergic reaction to a transfusion,
including urticaria, erythema (skin redness), and itching. What is
the most likely source of the allergen? - correct answer-
Plasma proteins
,Mild allergic reactions result from a patient's hypersensitivity to
soluble allergens in the plasma of the donor unit. The blood
recipient forms antibodies to these allergens that are bound to
IgE on mast cells and cause the release of histamines. Allergen
substances may be drugs or food consumed by the blood donor.
Adiponectin: - correct answer- Is aprotective
cytokine. This cytokine is anti-inflammatory and increases insulin
sensitivity. Adiponectin is usually decreased in obesity
Alder-Reilly inclusions: - correct answer-
Mucopolysaccarids
Alpha thalassemia major: - correct answer-
Alpha thalassemia Major: - correct answer- AKA
as Hydrops Fetalis, is exhibited when all four alpha chain gene
loci are deleted or non-functional. The alpha chain is crucial to
the formation of hemoglobin variants that can conduct normal
oxygen transport and gas exchange. The genetic code --/-- is
incompatible with life.
Amorphous phosphate crystals are found in: - correct
answer- Amorphous phosphate, triple phosphate
,(ammonium magnesium phosphate), calcium phosphate, and
ammonium urate crystals are frequently found in alkaline urine
specimens
Amorphous urates is found in: - correct answer-
Acidic pH urine
ANA - correct answer- See 2 quiz #27
Approximately what percent of the overall population is Rh
negative: - correct answer- 15%
Average life span of platelets (in the body): - correct
answer- 9.5 days
B lymphocytes and T lymphocytes are derived from: - correct
answer- Hematopoietic stem cells
Beta thalassemia major - correct answer-
Beta thalassemia minor: - correct answer-
, Blood Gas Reference Ranges: - correct answer-
pH: 7.35-7.45
pCO2: 35-45 mm Hg
HCO3: 22-26 mM/L
pO2: 85-105 mmHg
Blood reaction grades; 1+, 2+, 3+ and 4+ - correct answer-
1+: reaction has numerous small clumps and cloudy red
supernatant
2+: has many medium-sized clumps and clear supernatant
3+: has several large clumps and clear supernatant
4+: has one solid clump, no free cells, and clear supernatant
Causes of Vitamin B12 deficiency: - correct answer-
Pericious anemia in relapse, Patients on chronic hemodialysis
and hodgkin disease
CD34 - correct answer- Best associated with stem
cells, present on undifferentiated pluipotential hemopoietic
stem cell. CD34 is a cell surface glycoprotein and functions as a
cell-cell adhesion factor
LATEST UPDATED VERSION 2026
A biomarker with a high specificity: - correct answer-
accurately detects the absence of disease and has few false-
positives
A biomarker with high sensitivity: - correct answer-
accurately identifies the presence of disease and hos few false-
negatives
A hapten is only antigenic when it is coupled with which of the
following: - correct answer- Proteins
A mojor action of angiotensin II is: - correct answer-
increased vasocontriction
A patient experiences a mild allergic reaction to a transfusion,
including urticaria, erythema (skin redness), and itching. What is
the most likely source of the allergen? - correct answer-
Plasma proteins
,Mild allergic reactions result from a patient's hypersensitivity to
soluble allergens in the plasma of the donor unit. The blood
recipient forms antibodies to these allergens that are bound to
IgE on mast cells and cause the release of histamines. Allergen
substances may be drugs or food consumed by the blood donor.
Adiponectin: - correct answer- Is aprotective
cytokine. This cytokine is anti-inflammatory and increases insulin
sensitivity. Adiponectin is usually decreased in obesity
Alder-Reilly inclusions: - correct answer-
Mucopolysaccarids
Alpha thalassemia major: - correct answer-
Alpha thalassemia Major: - correct answer- AKA
as Hydrops Fetalis, is exhibited when all four alpha chain gene
loci are deleted or non-functional. The alpha chain is crucial to
the formation of hemoglobin variants that can conduct normal
oxygen transport and gas exchange. The genetic code --/-- is
incompatible with life.
Amorphous phosphate crystals are found in: - correct
answer- Amorphous phosphate, triple phosphate
,(ammonium magnesium phosphate), calcium phosphate, and
ammonium urate crystals are frequently found in alkaline urine
specimens
Amorphous urates is found in: - correct answer-
Acidic pH urine
ANA - correct answer- See 2 quiz #27
Approximately what percent of the overall population is Rh
negative: - correct answer- 15%
Average life span of platelets (in the body): - correct
answer- 9.5 days
B lymphocytes and T lymphocytes are derived from: - correct
answer- Hematopoietic stem cells
Beta thalassemia major - correct answer-
Beta thalassemia minor: - correct answer-
, Blood Gas Reference Ranges: - correct answer-
pH: 7.35-7.45
pCO2: 35-45 mm Hg
HCO3: 22-26 mM/L
pO2: 85-105 mmHg
Blood reaction grades; 1+, 2+, 3+ and 4+ - correct answer-
1+: reaction has numerous small clumps and cloudy red
supernatant
2+: has many medium-sized clumps and clear supernatant
3+: has several large clumps and clear supernatant
4+: has one solid clump, no free cells, and clear supernatant
Causes of Vitamin B12 deficiency: - correct answer-
Pericious anemia in relapse, Patients on chronic hemodialysis
and hodgkin disease
CD34 - correct answer- Best associated with stem
cells, present on undifferentiated pluipotential hemopoietic
stem cell. CD34 is a cell surface glycoprotein and functions as a
cell-cell adhesion factor
