MLT Chemistry Quiz Questions
with Correct Answers
A decrease in blood volume triggers what system? - Answer-Renin-Angiotensin-
Aldosterone System
What are the 2 forms of Calcium? - Answer-Ionized (Active) and Protein Bound
Why must Calcium specimens be collected anaerobically? - Answer-loss of CO2 will
decrease pH and H+ ions compete with Ca ++ for albumin binding sites
How does PTH increase serum calcium levels? - Answer-Stimulates kidneys to
reabsorb Calcium ions
Does random error indicate imprecision or inaccuracy? - Answer-imprecision- changes
standard deviation
Does systemic error indicate imprecision or inaccuracy? - Answer-inaccuracy- changes
the mean
Low false NEGATIVES: Diagnostic Sensitivity or Specificity? - Answer-Diagnostic
Sensitivity
Low false POSITIVES : Diagnostic Sensitivity or Specificity? - Answer-Diagnostic
Specificity
What is Positive Predictive Value? - Answer-Probability that a "positive" result is a "true
positive"
What is Negative Predictive Value? - Answer-Probability that a "negative" result is a
"true negative"
What is parallel testing? - Answer-Obtain new lot of control. The recommendation is to
run the control material as a patient at least 20 times over 20 days "in parallel" with the
current control material
What are the percentages for the SD values in a normal gaussian distribution? -
Answer-+1 SD = 68% of all points; + 2 SD = 95% of all points; + 3SD = 99.7% of all
points
What are the chances of QC being out due to random variation? - Answer-1 in 20 (5 out
of 100)
with Correct Answers
A decrease in blood volume triggers what system? - Answer-Renin-Angiotensin-
Aldosterone System
What are the 2 forms of Calcium? - Answer-Ionized (Active) and Protein Bound
Why must Calcium specimens be collected anaerobically? - Answer-loss of CO2 will
decrease pH and H+ ions compete with Ca ++ for albumin binding sites
How does PTH increase serum calcium levels? - Answer-Stimulates kidneys to
reabsorb Calcium ions
Does random error indicate imprecision or inaccuracy? - Answer-imprecision- changes
standard deviation
Does systemic error indicate imprecision or inaccuracy? - Answer-inaccuracy- changes
the mean
Low false NEGATIVES: Diagnostic Sensitivity or Specificity? - Answer-Diagnostic
Sensitivity
Low false POSITIVES : Diagnostic Sensitivity or Specificity? - Answer-Diagnostic
Specificity
What is Positive Predictive Value? - Answer-Probability that a "positive" result is a "true
positive"
What is Negative Predictive Value? - Answer-Probability that a "negative" result is a
"true negative"
What is parallel testing? - Answer-Obtain new lot of control. The recommendation is to
run the control material as a patient at least 20 times over 20 days "in parallel" with the
current control material
What are the percentages for the SD values in a normal gaussian distribution? -
Answer-+1 SD = 68% of all points; + 2 SD = 95% of all points; + 3SD = 99.7% of all
points
What are the chances of QC being out due to random variation? - Answer-1 in 20 (5 out
of 100)
