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Flashcards in Fecal Analysis Deck (25)
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1

Uses for fecal analysis

bleeding in GI tract
differential diagnosis of diarrhea
steatorrhea, malabsorption, maldigestion
hepatic, biliary, & pancreatic diseases

2

composition of feces

undigested foodstuffs
intestinal epithelium
intestinal bacteria
GI secretions
bile pigments
electrolytes
water

3

Diarrhea formation

if water absorption is inhibited or inadequate time allowed for absorption
increased volume, liquidity & frequency of bowel movements

4

3 reasons for diarrhea

secretory-increased solute secretions by intestine draws water & electrolytes into intestine
osmotic- increases osmotically active solutes
intestinal hypermotility

5

examples of secretory diarrhea

enterotoxin-producing organisms
damage to mucosa due to drugs or disease

6

examples of osmotic diarrhea

maldigestion
malabsorption

7

examples of intestinal hypermotility diarrhea

abdominal distention stimulates motility
laxatives, stress, drugs etc

8

constipation

stationary bowel contents or decreased intestinal motility

9

steatorrhea

fecal fat excretion >7 g/day
common feature of malabsorption syndromes

10

look of steatorrhea feces

pale, greasy, spongy, or pasty & very foul smelling

11

specimen collection

clean, sealable, leakproof containers
avoid contamination w/ urine, toilet tissue or toilet water etc

12

normal color

brown due to urobilin

13

black color

blood in the upper GI tract
Fe therapy

14

Red color

blood in the lower GI
food dyes
drugs

15

Pale color

post hepatic obstruction

16

greasy, spongy feces

steatorrhea

17

mucus in feces

constipation, colon disease

18

consistency & form

normal: formed, cylindrical masses
may be bulky due to undigested foodstuffs or increased gas

19

odor

metabolic by-products of intestinal flora

20

WBCs present

indicates that intestinal wall is infected

21

WBCs not present

indicate that intestinal wall is not inovlved

22

Neutrophils

1 to 3/hpf indicative of invasive & inflammatory condition

23

Fecal fats

used to detect maldigestion or malabsorption
fat stains

24

Occult blood

blood not visually apparent
early symptom of colorectal cancer !!!!!

25

occult blood principle

GUAIAC-based: pseudoperoxidase activity of hemoglobin heme resulting in color change (blue = positive)