False-negative results for upper GI bleeding can be caused by:
A) Degradation of hemoglobin to porphyrin
B) Ingestion of excessive red meat
C) Aspirin and nonsteroidal anti-inflammatory agents
D) Ingestion of excessive folic acid

Question

Quizplus · Accepted Answer

Degradation of hemoglobin to porphyrin can lead to false-negative results in tests for upper GI bleeding because the test may not detect the degraded form of hemoglobin.

False-Negative Results for Upper GI Bleeding Can Be Caused By