LAB- Fecal Artifacts

Question 1

Components that are responsible for incorrect identification

Answer 1

Fecal Artifacts

Question 2

Components contained in feces

Answer 2

• Undigested food
• Digestive by-products
• Human cells
• Secretions from digestive tract
• Microorganisms

Question 3

Fecal artifacts are also known as

Answer 3

Confusers

Question 4

Resemble Taenia and other helminth eggs

Answer 4

Pollen

Question 5

How to differentiate pollen from taenia

Answer 5

• Check size and shape
• Contains little to no internal structures
• Lacks 6-hooked oncosphere lack of embryo wall

Question 6

Can be confused with helminth eggs

Answer 6

Vegetable cells

Question 7

How to differentiate vegetable cells from helminth eggs

Answer 7

• Lager in sizes compared to helminth eggs
• Polygonal and flattened
• Interior portion is unorganized and contain large vacuoles
• Contains thicker walls
• Distended (Has glycogen and starch inside)

Question 8

Has a ladder-like appearance

Answer 8

Vegetable spirals

Question 9

Can be confused with tape worms, as well as helminth larva because of shape and size

Answer 9

Vegetable spirals

Question 10

How to differentiate from other parasites

Answer 10

Lacks head or tail region

Question 11

May be confused with helminth larva (Hookworms and Strongyloides) because of shape and size

Answer 11

Plant Hair/Fiber

Question 12

How to differentiate plant hair from helminth larva

Answer 12

• Lack of head or tail region
• Often broke at one end
• Has a refractile center and has a transparent body as they lack internal structures

Question 13

Maybe confused with Cryptosporidium spp., Cyclospora spp., microporidia, helminth eggs, or protozoan cysts

Answer 13

Yeast (Normally present in stool especially when stool is stored for long periods of time)

Question 14

What does a high amount of yeast on a fresh stool sample indicate

Answer 14

Could indicate a possible yeast infection

Question 15

What should you do upon seeing yeast after 24 hours in a stool sample

Answer 15

Request for another sample as yeast usually increase in number after some time

Question 16

Shape of yeast

Answer 16

Round to oval in shape (4-8 um in size

Question 17

Has no internal structure or nucleus, is very refractile, and resembles protozoan cysts

Answer 17

Starch

Question 18

Shape and size of starch

Answer 18

round to irregular round shape and is considered a starch granule if <10 um

Question 19

Undigested starch in iodine staining has what type of color

Answer 19

Blue-black

Question 20

partially digested starch in iodine staining has what type of color

Answer 20

Red/pink

Question 21

Protistan parasites of crayfish and can be seen in stool after consuming crayfish

Answer 21

Beaver bodies

Question 22

Beaver bodies are also known as

Answer 22

Corpora parasitica

Question 23

Resembles helminth ova and has no clinical significance

Answer 23

Beaver bodies

Question 24

Is spherical in shape and is mistaken as E. nana and protozoan cysts

Answer 24

Fat globules

Question 25

Large amounts of may indicate presence of

Answer 25

Steatorrhea (presence of excess fecal fat)(Observation of >60 large, 6 to 75 um large droplets per HPO = steatorrhea)

Question 26

Normal samples contain how many droplets of fat globules

Answer 26

100 small droplets, <4 um in diameter per HPO

Question 27

Rectangular in shape that may or may not contain striations

Answer 27

Muscle fiber (Normally present especially in high red-meat diet)

Question 28

Muscle fiber is normally present in stool except when

Answer 28

There is an Increased amounts of striated fibers are seen in biliary obstruction and gastrocolic fistulas. Also in patients with pancreatic insufficiency, such as in cases of cystic fibrosis

Question 29

Presence of too much muscle fibers is known as

Answer 29

Creatorrhea

Question 30

Can be confused with tapeworm proglottid

Answer 30

Muscle fiber

Question 31

Can be seen in improperly prepared wet mounts/smear

Answer 31

Air bubbles