Sample Preparation and Handling Flashcards
Errors that occur prior to testing comprise 46-56% of all the errors encountered for laboratory samples.
Preexamination
Preexamination errors are sometimes called?
Pre-analytical errors
The most serious and potentially most dangerous preexamination error called?
Improper patient identification
It is the factor under the phlebotomist’s control that can create a change in test results.
Tourniquet
The tourniquet should be on the arm no longer than?
1 minute
This can affect the results of testing.
Vigorous exercise
This causes an increase in concentration.
A. Creatine Kinase
B. Aspartase Aminotransferase
C. Lactate Dehydrogenase
D. Bilirubin
E. Creatinine
F. Uric acid
Glucose changes due to stress and exercise
- Increased with stress
- Decreased with exercise
Hemoglobin changes due to stress and exercise
Decrease
Blood pressure changes due to the posture
Increase
Blood volume changes due to the posture
Decrease
Calcium changes due to the posture
Increase
In how many hours does a patient’s fasting?
8-12 hours
Fill in the blanks:
Most tubes should be filled at least ___ of the stated volume to be accurate.
75%
It is the most common factor that varies test results over which phlebotomists have control.
Order of draw
MCQ:
This common test requires chilling of the specimens and includes the following;
I. Ammonia
II. Acid phosphatase
III. Catecholamines
IV. Lactic acid
V. pH/blood gases
A. I, II, III, IV, V
B. I, II, III
C. II, III, IV, V
D. II, IV, V
A. I, II, III, IV, V
A common test that must be maintained at 37 degrees Celsius.
Cold agglutinins and Cryoglobulin
It can be detrimental to some samples. Bilirubin is especially vulnerable.
Ex. Vitamin C, E, and K
Exposure to light
The most common sample to be collected.
Urine
Once samples have been collected, they must be?
transported into the laboratory
