NCCT Phlebotomy Exam
Questions and Verified Answers
100% Correct | Grade A+
1. An ESRD patient has an IV in the left forearm and an AV fistula in the right
arm. The phlebotomist used an ETS to collect from the left antecubital area
and there was an error in the results. The phlebotomist should have collected
A. above the fistula in the right arm.
B. below the fistula in the right arm.
C. below the IV in the left arm.
D. above the IV in the left arm.
Answer> below the IV in the left arm. Rationale
It is very important for the phlebotomist to have an understanding of potential
hazardous venipuncture sites for accurate results and patient safety. An ESRD (end
stage renal disease) patient would have an AV fistula for vascular access during
dialysis procedures. It is never acceptable to draw from the arm with this device. In
this case, the best choice would be below the IV in the left arm. Drawing above the
IV would risk contaminating or diluting the blood sample with the contents of the
,fluid being administered.
2. In which of the following time frames should a tourniquet be routinely
released on a patient while performing a blood draw?
A. within 30 seconds
B. within one minute
C. within three minutes
D. within five minutes
Answer> within one minute Rationale
Prolonged tourniquet time can cause hemoconcentration. Hemoconcentration is the
change in analyte values within the blood by leaving the tourniquet on more than 1
minute.
3. After cleansing the site for a venipuncture with alcohol, it should be allowed
to completely dry to avoid
A. hemoconcentration.
B. hemolysis.
C. hemostasis.
D. hemodilution.
Answer> hemolysis.
,Rationale
In preparing a site for venipuncture or dermal collection, the 70% alcohol should be
allowed to completely dry. This accomplishes two things it gives the solution time to
destroy bacteria and prevents the aqueous alcohol solution from causing hemolysis
of the red blood cells which might affect the test results. Hemoconcentration occurs
when a tourniquet is left on too long and the quantity of analytes in the blood
changes. Hemodilution is the opposite of hemoconcentration where the ratio of cells
to fluid decreases. Hemostasis is the act of stopping blood flow or bleeding.
4. Why should the phlebotomist avoid collecting a CBC from a crying infant?
A. The specimen may be hemolyzed.
B. WBC's may be elevated
.C. The specimen may be hemoconcentrated.
D. Platelets are more likely to clump.
Answer> WBC's may be elevated. Rationale
Stress or crying will elevate the white blood cell (WBC) count. This makes it difficult
to assess if an elevated count is due to a disease process or if it's stress-induced.
Crying will not make the specimen hemolyzed, hemoconcentrated or platelets more
likely to clump.
5. Which of the following tubes must be filled to at least 90% for a single test?
, A. green
B. pink
C. light blue
D. lavender
Answer> light blue
Rationale
A light blue tube is used for coagulation tests. It contains sodium citrate as an
anticoagulant which preserves the clotting factors to be measured. The tube must
be filled adequately (90%) as the correct patient result depends on a ratio of 9 parts
blood to 1 part anticoagulant. While the green, pink and lavender tubes should be
completely filled if possible, the 90% requirement is not necessary.
6. When a blood sample does not meet sample size criteria, it is considered
to be which of the following?
A. QA
B. QC
C. hemolyized
D. QNS
Answer> QNS
Rationale
Questions and Verified Answers
100% Correct | Grade A+
1. An ESRD patient has an IV in the left forearm and an AV fistula in the right
arm. The phlebotomist used an ETS to collect from the left antecubital area
and there was an error in the results. The phlebotomist should have collected
A. above the fistula in the right arm.
B. below the fistula in the right arm.
C. below the IV in the left arm.
D. above the IV in the left arm.
Answer> below the IV in the left arm. Rationale
It is very important for the phlebotomist to have an understanding of potential
hazardous venipuncture sites for accurate results and patient safety. An ESRD (end
stage renal disease) patient would have an AV fistula for vascular access during
dialysis procedures. It is never acceptable to draw from the arm with this device. In
this case, the best choice would be below the IV in the left arm. Drawing above the
IV would risk contaminating or diluting the blood sample with the contents of the
,fluid being administered.
2. In which of the following time frames should a tourniquet be routinely
released on a patient while performing a blood draw?
A. within 30 seconds
B. within one minute
C. within three minutes
D. within five minutes
Answer> within one minute Rationale
Prolonged tourniquet time can cause hemoconcentration. Hemoconcentration is the
change in analyte values within the blood by leaving the tourniquet on more than 1
minute.
3. After cleansing the site for a venipuncture with alcohol, it should be allowed
to completely dry to avoid
A. hemoconcentration.
B. hemolysis.
C. hemostasis.
D. hemodilution.
Answer> hemolysis.
,Rationale
In preparing a site for venipuncture or dermal collection, the 70% alcohol should be
allowed to completely dry. This accomplishes two things it gives the solution time to
destroy bacteria and prevents the aqueous alcohol solution from causing hemolysis
of the red blood cells which might affect the test results. Hemoconcentration occurs
when a tourniquet is left on too long and the quantity of analytes in the blood
changes. Hemodilution is the opposite of hemoconcentration where the ratio of cells
to fluid decreases. Hemostasis is the act of stopping blood flow or bleeding.
4. Why should the phlebotomist avoid collecting a CBC from a crying infant?
A. The specimen may be hemolyzed.
B. WBC's may be elevated
.C. The specimen may be hemoconcentrated.
D. Platelets are more likely to clump.
Answer> WBC's may be elevated. Rationale
Stress or crying will elevate the white blood cell (WBC) count. This makes it difficult
to assess if an elevated count is due to a disease process or if it's stress-induced.
Crying will not make the specimen hemolyzed, hemoconcentrated or platelets more
likely to clump.
5. Which of the following tubes must be filled to at least 90% for a single test?
, A. green
B. pink
C. light blue
D. lavender
Answer> light blue
Rationale
A light blue tube is used for coagulation tests. It contains sodium citrate as an
anticoagulant which preserves the clotting factors to be measured. The tube must
be filled adequately (90%) as the correct patient result depends on a ratio of 9 parts
blood to 1 part anticoagulant. While the green, pink and lavender tubes should be
completely filled if possible, the 90% requirement is not necessary.
6. When a blood sample does not meet sample size criteria, it is considered
to be which of the following?
A. QA
B. QC
C. hemolyized
D. QNS
Answer> QNS
Rationale
