5 results
What is Fecal Occult Blood Testing (FOBT)
 • Screening for colorectal cancer in average risk population
setting - Guaiac ... Testing #FOBT #Guaiac ... #FalsePositives
Vitamin B12 (Cobalamin) Deficiency
Etiology:
 • Vit B12 - aka cobalamin. Present in foods derived from animal
Vitamin B12 (Cobalamin ... Etiology: • Vit B12 ... who don't take B12 ... - Low Vit B12 ... level (< 200 pg
Causes of Inaccurate Fecal Occult Blood Test Results 

False Positive gFOBT:
Ingestion of nonhuman heme (eg, meat
medication #Guaiac ... Testing #Laboratory #FalsePositive
1,3-Beta-D-Glucan and Galactomannan Testing Sensitivity Specificity and False Positives
1,3-Beta-D-Glucan
 • Cell wall component of many fungi
Mucormycosis • Neg (<60 pg ... Fungal #Testing #FalsePositives
Cobalamin (vitamin B12)
In the diet:
5-15 pg/day (min. 1-5)
B12
Protein
HC
pH t
B12
Duodenum
Stomach
1
B12
R-protein
Protein
From saliva
R-protein
Intrinsic factor
Pancreas
B12
R-Protein
Trypsin
B12
Terminal ileum
B12
IF
2
Specific binding to receptors of
Cobalamin (vitamin B12 ... the diet: 5-15 pg ... day (min. 1-5) B12 ... Protein HC pH t B12 ... IF B12 pH >