Chemistry Flashcards
Which of the following actions is appropriate given the results below?
Sample type freshly voided urine
pH 5.5
Crystals large rhomboid plates with notched corners
Identify as cholesterol
Which of the following statements best explains the hemostasis interference given below?
Unconjugated bilirubin increased
Free hemoglobin levels present
Methemoglobin increased
a. Light transmittance is being impeded by the plasma colour
b. Electromechanical detection is being impeded by sample colour
c. Photo-optical detection is being concealed by sample turbidity
d. Mechanical detection is being prolonged by thrombin generation
A
Which of the following activities describes when a schedule is created for validation of a new analyzer?
a. Quality assurance
b. Quality control
c. Quality assurance
d. Quality improvement
A
Which of the following signals is detected in pyrosequencing?
Chemiluminescence
Which of the following factors may cause a delta check flag on a urea result when using the urease enzymatic method?
A. The patient was in supine position during venipuncture
B. Specimen was collected in ammonium heparin
C. The patient was pumping their fist during venipuncture
D. Specimen was collected in sodium heparin
B
Refrigeration enhances the precipitation of these urine crystals and they dissolve when heated:
Amorphous urates
Which of the following hormones promotes hyperglycemia?
A. Calcitonin
B. Growth hormone
C. Aldosterone
D. Renin
B
Ketone component measured by nitroprusside reaction?
A. Acetoacetic acid
B. Beta-hydroxybutyric acid
C. Acetone
D. C-reactive protein
A
What solution would be used to remove protein from an ion selective electrode?
A. Distilled water
B. 6N HCl
C. 0.1M HCl
D. Valinomycin
C
Which statement about urine is true?
A. High protein diets promote alkaline urine pH
B. pH tends to decrease as urine is stored
C. Contamination should be suspected if urine pH is less than 4.5
D. Bacteriuria is most often associated with a low urine pH
C
Electrophoretic movement of proteins toward the anode will decrease by increasing the:
A. Buffer pH
B. Ionic strength of the buffer
C. Current
D. Voltage
B
In most circumstances, when 2 controls within a run are both greater than +2s from the mean, what action should be taken first?
A. Recalibrate, then repeat controls followed by selected patient samples if QC control is acceptable
B. Repeat the controls before taking any corrective action
C. Change the reagent lot then recalibrate
D. Prepare fresh standards and recalibrate
A
