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Terms in this set (24)
Describe how tubes w/anticoagulant should be inverted
Inverted gently & completely 5 to 10 times immediately after sample is drawn
What tests can be affected by glycolysis
- Glucose
- Calcitonin
-
Phosphorus
- Aldosterone
- A number of enzymes
How soon after collection should cells be separated from plasma or serum?
No more than 2 hours
How can specimens be maintained at 37 C during transport and handling?
- Warmed in a heel warmer
- Incubator
What is the purpose of chilling a specimen?
- Slows metabolic process
- Keeps analytes stable during transport & handling
What minimal documentation should be included with each specimen delivered to the lab?
- Patient's name
- Patient's hospital number & room number
- Specimen type
- Date & time of delivery to the drop-off area
- Name of person depositing the
specimen
What are some disadvantages to the pneumatic tube system?
- Unreliability of system
- Speed of delivery
- Potential for specimen damage during transport
- Cost of alternative
What is the purpose of an accession number?
Unique identifying number used for cataloging a sample in the lab
Explain why it is important that a centrifuge carry a balanced load
The rotor of the centrifuge may spin out of center, which can damage centrifuge & cause samples to break
Describe what aliquots are & how they are prepared
- Small portions of a specimen transferred into separate containers for distribution to a variety of lab departments
-
All tubes should be labeled before filling & then capped before delivery to appropriate department
- Aliquots are removed w/any one of several types of disposable pipetting systems
Describe the procedure for removing a stopper
- Place a 4-X 4-inch gauze pad over top
- Pull the stopper straight up, twisting if necessary
- Do not rock it from side to side or pop off
How should stat specimens be transported to the laboratory, as opposed to routine specimens?
- Stat Specimen: immediately after being drawn
- Routine Specimen: within 45 min of being drawn
Explain the purpose of maintaining tubes in an upright position during transportation
- To allow complete clot formation
- Prevent sample contamination
due to prolonged contact w/stopper
- Reduce formation of aerosol during uncapping
List the reasons specimens should be delivered under a time constraint to the lab
- Will ensure quality of test results
- Glycolysis & other chemical changes increase as time passes
Name the light-sensitive analytes, & describe how to handle these specimens
- Bilirubin
- Vitamin B₁₂
- Carotene
- Folate
- Urine porphyrin
- Specimen must be protected from light
- The tube must be wrapped in aluminum foil or amber-colored tube must be used
Which of these practices is NOT recommended during specimen transport?
a. Placing the sample in a leak-proof bag
b. Carrying the specimen upright
c. Carrying specimen at a 45-degree angle
d.
Labeling samples from outside the hospital with a biohazard symbol
C
Cold agglutinins & cryofibrinogen samples should be
a. chilled before colleciton
b. transported on ice to the laboratory
c. warmed before the collection & transported warm
d. transported at room temperature
C
Infant bilirubins are
transported
a. on ice
b. in amber-colored microtubes
c. in a heel-warmer packet
d. without special transport measures
B
Once a cap is removed from a blood tube, the pH
a. may decrease
b. may increase
c. will not change
d. becomes alkaline
B
Which of the following can be centrifuged immediately after
collection?
a. Serum separator tubes
b. Clot tubes
c. Thrombin tubes
d. Sodium citrate tubes
D
Which of the following specimens would not be rejected?
a. a CBC collected in a lithium heparin tube
b. An EDTA tube used for a chemistry test
c. A sodium level collected in a sodium heparin tube
d. A cold agglutinin sample transported in a heel-warmer packet
D
Complete blood clotting may take _________ at room temperature.
a. 10 to 15 minutes
b. 20 to 30 minutes
c. 30 to 45
d. 1 hour
C
The major risk of stopper removal is
a. glycolysis
b. hemolysis
c. aerosol
d. clotting
C
Which of the following is used to identify a
patient specimen in the laboratory?
a. Name of the collector of the specimen
b. Accession number
c. Specimen type
d. Name of person depositing specimen in the laboratory
B
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