Which of the following gastrointestinal adverse effects may occur in patients using iron supple-ments?
a. Stools may be green and test falsely negative for occult blood.
b. Stools may be black and test falsely positive for occult blood.
c. Stools may be dark red and test falsely positive for occult blood.
d. Stools may be dark brown or black and test falsely negative for occult blood.
ANS: B
In patients taking iron supplements, occult blood in stools may be obscured by the black colora-tion of iron in stool. Guaiac test results may occasionally be false-positive.
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