Tricky! Yes, fecal occult blood test would pick up hemorrhoid blood and this is a male <50yo, so case closed right?
Wrong! Hematocrit = 35% --> hgb = 35/3 = 11.7 < 13.5 (normal)
Why is he anemic? Do a colonoscopy.
My understanding is that occult blood is commonly due to an upper GI bleed. Wouldn't the colon produce gross blood? I'm hopelessly lost in these matters.