A prebiotic score is a term sometimes used to estimate the health effects of prebiotics in humans or animals. There is no definition of prebiotic scores. The idea is that prebiotics may have many different effects in the human gut, some of these may be quantified and combined to an overall score. For example, an increase in bifidobacteria or a decrease in Clostridium perfringens

Clostridium perfringens

Clostridium perfringens is a Gram-positive, rod-shaped, anaerobic, spore-forming bacterium of the genus Clostridium. C. perfringens is ever present in nature and can be found as a normal component of decaying vegetation, marine sediment, the intestinal tract of humans and other vertebrates,...

can be quantified. Also increases and reductions of certain enzymes may be used as factors in a prebiotic score.