Chemical Testing of Feces Flashcards
Methods for detecting fecal occult blood
guaiac
immunochemical
fluorometric porphyrin quantification tests.
most frequently used screening Lest for fecal blood is the
guaiac-based test for occult blood (gFOBT) based on detecting
the pseudoperoxidase activity of hemoglobin
Guaiac-Based Fecal Occult Blood Tests
specific for the globin portion of human hemoglobin and uses polyclonal anti-human hemoglobin antibodies
Interpretation: Positive test and control lines indicate GI bleeding
Immunochemical Fecal Occult Blood Test
The test measures both intact hemoglobin and the hemoglobin that has been converted to porphyrins.
Porphyrin-Based Fecal Occult Blood Test
confirmatory test for steatorrhea
quantitative fecal fat analysis
gold standard and method routinely used for fecal fat measurement
Van de Kamer titration
A rapid (5 minutes) and safe procedure for analyzing quantitative fecal fat is the _
hydrogen nuclear magnetic resonance spectroscopy (H-NMR)
rapid test to estimate the amount of fat excretion; a reliable tool to monitor a patients response to therapy in screen for steatorhea in pediatric populations
acid steatocrit
fecal enzymes focuses on proteolytic enzymes
trypsin
chymotrypsin
elastase I
Decreased production of these enzymes (pancreatic insuf- ficiency) is associated with disorders such as _
chronic pancreatitis and cystic fibrosis
Emulsified specimen placed on x-ray paper determines ability to digest gelatin
Trypsin
test performed in fecal carbohydrates
copper reduction test
