Chapter 11 Answers: Special Collections & Point-of-Care Testing

Chapter 11 Answers: Special Collections & Point-of-Care Testing

Chapter 11 focuses on special collections and point-of-care testing procedures essential for laboratory professionals. It covers key topics such as blood culture collection, patient identification, and specimen labeling, ensuring accurate testing results. This chapter is designed for medical laboratory students and professionals seeking to enhance their understanding of blood bank tests and therapeutic drug monitoring. Detailed explanations of coagulation specimens and chain-of-custody procedures are also included, making it a comprehensive resource for those preparing for certification exams or improving clinical practices.

Key Points

  • Explains blood culture collection techniques and sterile procedures.
  • Details patient identification and specimen labeling for blood bank tests.
  • Covers therapeutic drug monitoring, including peak and trough levels.
  • Includes special handling procedures for coagulation specimens.
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UNIT IV SPECIAL PROCEDURES
CHAPTER
11
Special Collections and
Point-of-Care Testing
OBJECTIVES
Study the
information in
your textbook
that corresponds
to each objective
to prepare
yourself for the
activities in this
chapter.
1 Defi ne the key terms and abbreviations at the beginning of this chapter.
2 Explain the principle behind each special collection procedure, identify the steps
involved, and list any special supplies or equipment required.
3 Describe patient identifi cation and specimen labeling procedures required for blood
bank tests and identify the types of specimens typically required.
4 Describe sterile technique in blood culture collection, explain why it is important,
and list the reasons why a physician might order blood cultures.
5 List examples of coagulation specimens and describe how to properly collect and
handle them.
6 Describe chain-of-custody procedures and identify the tests that may require them.
7 Explain the importance of timing; identify the role of drug half-life, providing
names of drugs as examples; and describe peak, trough, and therapeutic levels in
therapeutic drug monitoring.
8 Defi ne point-of-care testing (POCT), explain the principle behind the POCT
examples listed in this chapter, and identify any special equipment required.
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198 UNIT IV: SPECIAL PROCEDURES
Matching
Use choices only once unless otherwise indicated.
MATCHING 11-1: KEY TERMS AND DESCRIPTIONS
Match the key term with the best description.
Key Terms (1–18)
1. _____ ACT
2. _____ Aerobic
3. _____ Anaerobic
4. _____ ARD
5. _____ autologous
6. _____ BAC
7. _____ Bacteremia
8. _____ BNP
9. _____ BT
10. _____ Chain of custody
11. _____ Compatibility
12. _____ CRP
13. _____ EQC
14. _____ ETOH
15. _____ FAN
16. _____ FUO
17. _____ GTT
18. _____ HCG
Key Terms (19–37)
19. _____ Hypoglycemia
20. _____ Hyperkalemia
21. _____ Hypernatremia
22. _____ iCa
2
23. _____ INR
24. _____ K
25. _____ Lactate
26. _____ Lookback
27. _____ Lysis
28. _____ NIDA
29. _____ Peak level
30. _____ POCT
Descriptions (1–18)
A. Abbreviation for ethanol
B. Activated clotting time
C. Antimicrobial removal device
D. Bacteria in the blood
E. Platelet function test
F. Instrument’s electronic QC check
G. Donating blood for one’s own use.
H. Without air or able to live without oxygen
I. Fastidious antimicrobial neutralization
J. Fever of unknown origin
K. Cardiac hormone produced in response to pressure overload
L. Hormone detected with POCT pregnancy test
M. Detailed documentation for forensic specimens collections
N. Ability to be mixed together without unfavorable effects
O. Test used to diagnose carbohydrate metabolism problems
P. Blood alcohol concentration
Q. With air or able to live only in the presence of oxygen
R. Nonspecifi c marker for infl ammation
Descriptions (19–37)
A. After a meal
B. Highest serum drug concentration anticipated
C. The mineral potassium
D. Decreased blood sugar levels
E. Drug level testing collected at specifi c times
F. Specifi c heart muscle protein staying elevated up to 14 days
G. Standardized form of PT results
H. Ionized form of calcium
I. Microorganism and toxins in the blood
J. National Institute on Drug Abuse
K. Lowest serum drug concentration expected
L. Requires blood unit components to be traceable to the donor
M. Specifi c heart muscle protein showing elevation in 3 to 6 hours
N. Increased blood sodium levels
O. Rupturing, as in the bursting of a red blood cell
P. Level of this analyte marks severity of metabolic acidosis
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CHAPTER 11: SPECIAL COLLECTIONS AND POINT-OF-CARE TESTING 199
31. _____ PP
32. _____ Septicemia
33. _____ TDM
34. _____ TGC
35. _____ TnI
36. _____ TnT
37. _____ Trough level
MATCHING 11-2: POC TESTS AND INSTRUMENTS USED FOR TESTING
Match the following tests to the POCT instruments (instruments can only be used once).
POC Tests
A. CK-MB
B. Lactate
C. Glycosylated hgb
D. Hemoglobin
E. P
CO
2
F. PT
G. TnT
H. BUN
I. BNP
J. Hematocrit
K. -ketone
L. UA
M. Guaiac
N. HCG
O. CRP
P. Platelet function
MATCHING 11-3: SPECIAL TEST COLLECTION, EQUIPMENT, OR PROCEDURE
Match the following tests with the special equipment or procedure involved. (Answers can be used only once.)
Special Test
1. _____ 2-hour PP
2. _____ Blood alcohol
3. _____ Blood culture
4. _____ Blood type and screen
5. _____ BT
POCT Instruments
1. _____ Verify Now
2. _____ Quidel Quick Vue
3. _____ Precision XceedPro
4. _____ StatSpin CritSpin
5. _____ Hemoccult II Sensa
6. _____ CARDIAC T Rapid Assay
7. _____ Cholestech LDX
8. _____ Triage MeterPro
9. _____ GEM Premier 4000
10. _____ HemoCue HB 201
11. _____ DCA Vantage
12. _____ Triage Cardiac Panel
13. _____ CoaguChek
14. _____ i-STAT
15. _____ ABL80
16. _____ Clinitek 2001
Special Handling, Equipment, or Procedure
A. Draw in trace elementfree tube.
B. Involves intradermal injection of diluted antigen.
C. May require a proctor present at the time of collection.
D. May require photo identifi cation before collection.
E. Requires serial collection of blood specimens at specifi c times.
F. Patient ID procedures are extra strict.
G. Requires a 9-to-1 ratio of blood to anticoagulant in the collection tube.
Q. Testing performed at the patient’s side
R. Increased blood potassium
S. Intensive insulin therapy to control glucose levels
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FAQs of Chapter 11 Answers: Special Collections & Point-of-Care Testing

What are the key procedures for blood culture collection?
Blood culture collection requires strict aseptic techniques to prevent contamination. The process starts with identifying a suitable venipuncture site and performing a friction scrub to disinfect the area. After allowing the site to dry, the culture bottles must be cleansed before inoculation. Proper labeling with patient ID and collection site is crucial for accurate results, ensuring that any potential infections are correctly identified and treated.
What is the significance of therapeutic drug monitoring?
Therapeutic drug monitoring (TDM) is essential for managing medications that have narrow therapeutic ranges. This process involves measuring drug levels at specific times, known as peak and trough levels, to ensure efficacy while minimizing toxicity. Understanding drug half-lives and timing of doses is crucial for patient safety and effective treatment. TDM is particularly important for drugs like anticoagulants and anticonvulsants, where precise dosing can significantly impact patient outcomes.
What are the special considerations for coagulation specimens?
Coagulation specimens require careful handling to ensure accurate test results. Blood should be drawn into specific tubes with the correct anticoagulant in a precise ratio, typically 9:1 for blood to anticoagulant. Timing is also critical, as factors like patient medication and the timing of the draw can affect results. Proper labeling and storage conditions must be maintained to prevent degradation of the sample before testing.
How does point-of-care testing (POCT) differ from traditional lab testing?
Point-of-care testing (POCT) allows for immediate diagnostic results at the patient's side, enhancing clinical decision-making. Unlike traditional lab testing, which may take hours or days for results, POCT provides rapid feedback, facilitating timely interventions. This approach is particularly beneficial in emergency settings and for managing chronic conditions, as it can improve patient outcomes by allowing for quicker adjustments to treatment plans.

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