Buderus et al. reported much higher fecal lactoferrin levels in IBD patients (313.60 ± 46.4 μg/g in CD and 370.70 ± 46.90 μg/g in UC), while IBS patients had extremely low levels (1.3 ± 0.5 μg/g) [15]. Here, LTF is linked to irritable bowel syndrome.