ASCP MEDICAL LABORATORY TECHNICIAN - MLT(ASCP) - ASCP-MLT Exam Practice Test
This patient is most likely suffering from an immediate-acting coagulation inhibitor; most commonly, lupus anticoagulant. Notice that the addition of normal pooled plasma does not correct upon initial or incubated mix, which means that the inhibitor is not time or temperature-dependent.
Factor VIII is not the correct answer as a factor deficiency would have corrected upon the addition of normal pooled plasma. Factor VII is not the correct answer, as the aPTT assay does not account for factor VII activity or concentration.
The laboratorian completed the mixing study ordered for John Doe. The results are as follows:
Initial aPTT result: 167 seconds
Initial 1:1 Mix with Normal Pooled Plasma: 158 seconds
Incubated 1:1 Mix with Normal Pooled Plasma: 150 seconds
Which of the choices below would most likely explain the results for this patient?
Factor VIII is not the correct answer as a factor deficiency would have corrected upon the addition of normal pooled plasma. Factor VII is not the correct answer, as the aPTT assay does not account for factor VII activity or concentration.
The laboratorian completed the mixing study ordered for John Doe. The results are as follows:
Initial aPTT result: 167 seconds
Initial 1:1 Mix with Normal Pooled Plasma: 158 seconds
Incubated 1:1 Mix with Normal Pooled Plasma: 150 seconds
Which of the choices below would most likely explain the results for this patient?
Correct Answer: A
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1. B
2. D
3. A
4. C
Red to Brown Urine: porphobilinogen, hematuria, myoglobinuria, etc.
Green: Food colorings; Increased carotene in the diet;
Pseudomonas aeruginosa infection
Yellow: bilirubin, bile pigments
White: phosphates, other crytals
Match urine color with substance that might have been responsible:
1. Phosphates
2. Bilirubin
3. Pseudomonas
4. Porphobilinogen
2. D
3. A
4. C
Red to Brown Urine: porphobilinogen, hematuria, myoglobinuria, etc.
Green: Food colorings; Increased carotene in the diet;
Pseudomonas aeruginosa infection
Yellow: bilirubin, bile pigments
White: phosphates, other crytals
Match urine color with substance that might have been responsible:
1. Phosphates
2. Bilirubin
3. Pseudomonas
4. Porphobilinogen
Correct Answer: A,B,C,D
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Synovial fluid is actually quite viscous and does not have the same consistency as plasma. The reason for its thicker consistency is to provide cushion and reduce friction between the articular cartilage of synovial joints during movement.
Urinalysis & Other Body Fluids
All of the statements below about synovial fluid are true EXCEPT:
Urinalysis & Other Body Fluids
All of the statements below about synovial fluid are true EXCEPT:
Correct Answer: A
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Patients with antibody to the following antigen are immune to Hepatitis B:
Correct Answer: C
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A clinical laboratory scientist or medical laboratory scientist (or medical technologist in older terminology) may serve as all of the following except:
Correct Answer: C
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All of the following activities are associated with platelets EXCEPT:
Correct Answer: A
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L/S ratio <2.0 indicates an increased risk of respiratory distress syndrome (RDS) at delivery. L/S ratio <1.5 indicates a very high risk of developing RDS.
Which of the following statements regarding the L/S ratio is TRUE?
The correct answer is highlighted below
A ratio of 2:1 or greater usually indicates adequate pulmonary surfactant to prevent respiratory distress syndrome (RDS) A ratio of 1.5:1 indicates fetal lung maturity in pregnancies associated with diabetes mellitus.
Sphingomyelin levels increase during the 3rd trimester causing the L/S ratio to fall slightly during the last two weeks of gestation.
A phosphatidylglycerol (PG) spot indicates the presence of meconium in the amniotic fluid Lecithin is in direct ratio with sphingomyelin Heparin contamination is characterized by an elevation in the aPTT test and can also cause an increased PT test as well. Reptilase time tests are used to elimate the effects of heparin contamination as the reagents and method are resistant to the effects of antithrombin III, unlike the PT and aPTT tests. Therefore, it would be expected that a patient sample containing pre-analytical heparin contamination will show an increased aPTT (and sometimes PT as well) while showing a normal reptilase time.
A specimen drawn from an indwelling catheter that was contaminated by heparin would be indicated by:
Which of the following statements regarding the L/S ratio is TRUE?
The correct answer is highlighted below
A ratio of 2:1 or greater usually indicates adequate pulmonary surfactant to prevent respiratory distress syndrome (RDS) A ratio of 1.5:1 indicates fetal lung maturity in pregnancies associated with diabetes mellitus.
Sphingomyelin levels increase during the 3rd trimester causing the L/S ratio to fall slightly during the last two weeks of gestation.
A phosphatidylglycerol (PG) spot indicates the presence of meconium in the amniotic fluid Lecithin is in direct ratio with sphingomyelin Heparin contamination is characterized by an elevation in the aPTT test and can also cause an increased PT test as well. Reptilase time tests are used to elimate the effects of heparin contamination as the reagents and method are resistant to the effects of antithrombin III, unlike the PT and aPTT tests. Therefore, it would be expected that a patient sample containing pre-analytical heparin contamination will show an increased aPTT (and sometimes PT as well) while showing a normal reptilase time.
A specimen drawn from an indwelling catheter that was contaminated by heparin would be indicated by:
Correct Answer: B
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Assuming an alpha hemolytic reaction (not well seen in the image), viridans streptococcus and S. pneumoniae are the two possible responses. However, these colonies are far too mucoid for viridans streptococci; therefore,
S. pneumoniae is the most likely choice. Also, the colonies are much too large and the hemolytic reaction is wrong for S. pyogenes or S. agalactiae.
A patient was admitted to the hospital recently with an obvious infection. A sputum specimen was submitted and the microbiologist inoculated it to sheep blood agar. Based on the colony morphology and the alpha hemolysis seen in the image to the right, the most likely identification is:
S. pneumoniae is the most likely choice. Also, the colonies are much too large and the hemolytic reaction is wrong for S. pyogenes or S. agalactiae.
A patient was admitted to the hospital recently with an obvious infection. A sputum specimen was submitted and the microbiologist inoculated it to sheep blood agar. Based on the colony morphology and the alpha hemolysis seen in the image to the right, the most likely identification is:
Correct Answer: A
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A dilution commonly used for a routine sperm count is a 1:20.
A dilution commonly used for a routine sperm count is:
A dilution commonly used for a routine sperm count is:
Correct Answer: B
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Incompatiblity involving the ABO blood group system can cause the most severe type of transfusion reaction.
The cause of the most severe life-threatening hemolytic transfusion reactions is:
The cause of the most severe life-threatening hemolytic transfusion reactions is:
Correct Answer: A
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In the laboratory, surfaces must be disinfected for blood spills. What is the most common disinfectant used?
Correct Answer: C
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Waived tests are those considered to have an insignificant risk of erroneous results. Which of the following is NOT an example of a waived test?
Correct Answer: C
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Iron deficiency anemia, or IDA, is associated with an increased TIBC as there is less iron to bind to transferrin. Microcytic, hypochromic red cell morphology, a decreased serum iron level, a decreased serum ferritin level, and a decreased hemoglobin level are all characteristics associated with IDA.
All of the following are characteristic findings in patients with iron deficiency anemia EXCEPT:
All of the following are characteristic findings in patients with iron deficiency anemia EXCEPT:
Correct Answer: D
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Which of the following could reduce the risk of a patient becoming infected with a hospital acquired infection?
Correct Answer: A
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