Effect of iron on the guaiac reaction

Patient-Care Questions that Physicians Are Unable to Answer

“…However, authors should explicitly answer recurring compound questions that commonly arise in practice (e.g., Oral iron does not cause the stool guaiac to turn positive. 42 Asking depressed patients about suicidal thoughts does not increase the likelihood of suicide. 43 ).…”

Evaluation and treatment of gastrointestinal bleeding in patients taking anticoagulants presenting to the emergency department

“…Computed tomography angiography (CTA) is the preferred diagnostic test of choice for unstable lower GI bleeds, while the utility of ultrasound is limited [25]. While a fecal occult blood test may help distinguish melena from iron it has no role in patients with significant GI bleeds [26].…”

Colorectal Cancer in Pregnant Woman

“…The test is more specific for left colon cancers and can cause false positive and false negative results (consumption of red meat, broccoli, iron medication, aspirin or derivatives, anticoagulants, etc.) [91][92][93]. Even in ideal conditions, only 5-10% of patients tested were found to have CRC and another 20-30% were found to have adenomatous polyps [94][95][96].…”