Fecalysis Cont

Question 1

Color of the fecal blood sample if the bleeding is in the lower GI tract:

Answer 1

Bright red

Question 2

Color of the fecal blood sample if the bleeding is in the upper GI tract:

Answer 2

Dark / mahogany-colored

Question 3

What is the term when a feces is dark or black due to the presence of large amount of blood?

Answer 3

Melena

Question 4

How much blood present in a stool sample to be considered pathologically significant?

Answer 4

2.5ml / 150g of stool

Question 5

True or false:

The presence of blood in the stool indicates that the patient has a disease.

Answer 5

False

Question 6

What are the methods in testing fecal occult blood?

Answer 6

Guaiac-based FOBT
Immunochemical FOBT
Porphyrin-based FOBT

Question 7

Among the methods of testing for fecal occult blood, which one is the most commonly performed?

Answer 7

Guaiac-based FOBT

Question 8

Which method of testing for fecal occult blood uses the pseudoperoxidase activity of the heme moiety of hemoglobin?

Answer 8

Guaiac-based FOBT

Question 9

Positive color for Guaiac-based FOBT

Answer 9

Blue-green to dark blue

Question 10

Which among the methods of for testing the fecal occult blood uses polyclonal antihuman antibodies?

Answer 10

Immunochemical FOBT

Question 11

Advantage/s and disadvantage/s of using immunochemical FOBT

Answer 11

Advantages:
Highly specific
No interference from foodstuff and meds

Diasdvantages:
Costly

Question 12

True or false:

Immunochemical FOBT may be automated and photometric or manual and
visual

Answer 12

True

Question 13

How is Porphyrin-based FOBT disadvantageous?

Answer 13

May cause false-positive results due to ingestion of red meats
Expensive
Time-consuming
Labor-intensive