3S [LAB]: Fecalysis Flashcards
Ideal sample amount in fecalysis
Thumb-sized
Transport of stool sample must be within ___ after collection
30 mins to 1 hour
Normal stool output
200 g/day
T/F: Viral and parasitic infections will cause the presence of WBC in the stool
False
T/F: It is not normal to see fat and muscle fibers in the stool
True
Confirmatory test for steatorrhea
Quantitative fecal fat testing
Quantitative fecal fat testing requires how many specimen/s?
3-day specimen
In quantitative fecal fat testing, what must be the regular intake of fat?
100 g/day
Identify the quantitative fecal fat testing method:
Gold standard
Van de Kamer titration
Identify the quantitative fecal fat testing method:
Measures 100% of total fat
Gravimetric method
Identify the quantitative fecal fat testing method:
Microwave-dried samples
Hydrogen nuclear magnetic resonance spectroscopy
Identify the quantitative fecal fat testing method:
Reliable rapid test
Acid steatocrit
Reagent used in acid steatocrit
5N perchloric acid
Identify the quantitative fecal fat testing method:
Response to therapy
Acid steatocrit
Identify the quantitative fecal fat testing method:
Pediatric patients
Acid steatocrit
Identify the quantitative fecal fat testing method:
No reagents
Near-infrared reflectance spectroscopy (NIRS)
Normal acid steatocrit result
<31% (adult)
<10% (children)
Differentiates fetal blood from maternal blood in infant stool
Fetal hemoglobin (APT Test)
Fecal enzyme:
Stable in the specimen for up to 10 days
Chymotrypsin/ trypsin
Principle of chymotrypsin
Gelatin hydrolysis
Fecal enzyme:
Isoenzyme of elastase produced in the pancrease
Elastase I
Fecal enzyme:
Sensitive indicator of exocrine pancreatic insufficiency
Elastase I
Result of increased CHO in stool
Osmotic diarrhea
Intestinal inability to reabsorb CHO
Celiac disease
