[Elizabeth_Zeibig]_Clinical_Parasitology__A_Practi(z-lib.org)

CHAPTER 2 Specimen Collection and Processing
15
2-9. State the purpose of concentration
techniques and, for each technique studied,
list the advantages and disadvantages.
2-10. Explain the purpose of a permanent stained
smear and summarize the characteristics of
the stains presented.
2-11. Describe the use of stool screening methods
and provide an example when these
methods would be used.
2-12. Explain the purpose of examining intestinal
specimens other than stool for parasites.
2-13. Describe the purpose, advantages, and
disadvantages of performing the proper
techniques for examining specimens other
than stool and intestinal samples for the
presence of parasites.
2-14. Describe the use of immunologic tests for
the diagnosis of parasitic diseases and
provide an example when antibody testing
might be used.
2-15. Match the specific immunologic tests
available with the parasite(s) that they can
detect.
2-16. Briefly describe the new techniques that
have been developed for parasite study.
2-17. Identify and describe the appropriate
information to include in the parasitology
test report.
2-18. Identify the appropriate areas to be
included in a parasitology quality assurance
program.
2-19. Analyze case studies with information
pertinent to this chapter and do the
following:
A. Interpret and explain the information,
data, and results provided.
B. Propose subsequent actions to be taken
and/or solutions, with justification.
CASE STUDY 2-1
UNDER THE MICROSCOPE
MP, a 26-year-old man, returned home from a spring ski
trip to the Rocky Mountain region and began to experience
intestinal unease, with nausea and abdominal fullness. He
then developed abdominal cramping and diarrhea, along
with hives. MP became concerned when the symptoms
continued beyond 1 week, and he presented to his family
physician. The physician decided to order laboratory tests
to determine the cause and ordered a stool for culture and
sensitivity. The results indicated “no Salmonella, Shigella,
E. coli O:157, or Campylobacter isolated.” On receiving
these results, the physician called the laboratory and
inquired about a workup for intestinal parasites.
Questions for Consideration
1. Which tests should the laboratory technician
recommend to detect the presence of parasites? (Objective
2-19B)
2. Describe the proper collection and transport of stool
samples for intestinal parasites. (Objective 2-2)
3. List the procedures that would be included in the routine
O&P examination. (Objective 2-3)
4. Suppose that the laboratory technician suggests that a
stool screen be performed initially and, if the results are
negative, then a complete O&P is indicated. Explain this
recommendation. (Objective 2-11)
FOCUSING IN
As noted in Chapter 1, parasitic diseases continue
to be a significant threat throughout the
world. Although they appear to be more prevalent
in underdeveloped tropical and subtropical
countries, parasites do occur in developed areas,
such as the United States. These diseases are
usually brought about by climate conditions
desirable for parasitic survival as well as poor
sanitation and personal hygiene practices of the
inhabitants. Certain populations are more at risk
of contracting parasitic infections, including
foreign visitors and those traveling and emigrating
to other countries.