Parasitology Laboratory Quiz1 Flashcards

1
Q

Most common procedure performed in the area of Parasitology

A

Examination of a stool specimen for ova and parasites

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2
Q

Typical stool collection protocol

A

3 specimens

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3
Q

Up to 6 specimens in 14 days

A

For amebiasis

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4
Q

Stool sample from patients whose therapy includes?

A

Barium, Bismuth, or mineral oil

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5
Q

Patient’s whosever in therapy should be collected prior to the therapy or not until?

A

5 to 7 days after the completions of therapy

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6
Q

For patient’s who have taken antibiotics or antimalarial medication should be delayed for how many weeks?

A

2 weeks following therapy

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7
Q

Containers for stool collection

A

Clean, watertight container with a tight-fitting lid

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8
Q

Acceptable amount of stool

A

2 to 5 g ( often referred to as the size of walnut

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9
Q

According to blank thumb-sized specimen of formed stool 5 to 6 tablespoon of watery stool

A

Belizario et al

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10
Q

Temporary storage of fecal samples in a refrigerator

A

3-5 degree celcious is acceptable

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11
Q

Are killed by refrigeration

A

Trophozoites

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12
Q

Are usually damage

A

Helminth eggs and protozoan cysts

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13
Q

NEVER

A

Freeze stool samples
Keep them in incubations

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14
Q

Should not be allowed to be contaminate the stool specimen

A

Urine

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15
Q

Stool should not be blank from toilet bowl water

A

Not be retrieved

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16
Q

Used to demonstrate the motility of protozoan trophozoites

A

Fresh specimens

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17
Q

Should be examined within 30 minutes of passage

A

Liquid stool

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18
Q

Should be evaluated within 1hour of passage

A

Semi formed specimen’s

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19
Q

Can be held for 24 hours

A

Formed stool specimens

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20
Q

Substance that preserve the morphology of protozoa and prevent further development of certain helminth eggs and larvae

A

Fixatives

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21
Q

5% ideally preserves protozoan cyts
10% preserve’s helminths eggs and larvae

22
Q

Adhesive for the stool when preparing slides for staining
Most often combined with schaudinn solutions

A

Polyvinyl Alcohol (PVA)

23
Q

Schaudinn Solutions contains?

A

Zinc sulfate, copper sulfate or mercuric chloride as a base)

24
Q

Can be used for performing concentration techniques and permanent stained smears
It is a liquid fixative with long-shell life

A

Sodium acetate formalin

25
Other alternatives to mercury- based PVA are the use of substitutes compounds contain copper sulfate or zinc sulfate
Modified polyvinyl alcohol
26
Free of formalin and mercury and can be used for concentration techniques and permanent stained smears alter
Alternative single vial system’s
27
contains merthiolate (also called thimerosal) and iodine which act as staining components, while formalin acts as the preservative
MERTHIOLATE-IODINE-FORMALIN
28
Determine: color and consistency
MACROSCOPIC EXAMINATION
29
Consistency or degree of moisture in a stool: can be classified as:
Formed Semi-formed Soft Loose Watery
30
Liquid stool
(+) protozoan trophozoites
31
Fully formed stools
(+) protozoan cysts
32
Liquid or formed stools
(+) Helminth eggs and larvae
33
color of the normal stool
Brown
34
Unusual colors of stools
purple, red or blue
35
should always be reported.
Presence of blood
36
responsible for the brown color of the stool
Stercobilin
37
suggests UPPER GIT Bleeding- esophagus, stomach and duodenum
Dark-colored blood
38
means LOWER GIT Bleeding 􏰁 ileum, jejunum, large intestine
Bright red blood
39
found in stool include adult worms, proglottids, pus & mucus
Gross Abnormalities
40
should be examined for parasites such as pinworms, tapeworm proglottids, and adult worms
Surface of the stool
41
may suggest presence of amebic ulcerations in the large intestine
Blood and/or mucus in loose/liquid stool
42
usually associated with irritation & bleeding
Bright red blood on the surface of a formed stool
43
3 DISTINCT PROCEDURES: should be performed on a fresh specimen
1. Direct Wet Preparations 2. Concentrated Technique resulting in concentrated wet preparations 3. Permanently stained smear
44
Main purpose: To detect the presence of motile protozoan trophozoites o made by placing a drop of 0.85% saline on a glass slide (a 3- × 2-inch size is suggested) and mixing with a small portion of unfixed stool using a wooden applicator stick or another mixing tool
DIRECT SALINE WET PREPARATION
45
Small portion of unfixed stool
About 2 mg of stool
46
is placed on the slide and the preparation is examined microscopically in a systematic fashion.
22-mm square cover slip
47
should be scanned using the low power (10×) objective on the microscope, and the power should only be increased when a suspicious object requires further investigation.
entire cover glass
48
kills the trophozoites present in a stool specimen.
Iodine
49
is placed over a glass slide and covered with cut cellophane paper soaked in a mixture of glycerine and malachite green solution
50 to 60 mg of stool
50
is a clearing solution and malachite green is used to give color to the cellophane in order to give a pale green background to the eggs and to minimize the brightness of the microscopic field.
Glycerine