Intestinal pH Prediction

Intestinal pH prediction estimates the acid-alkaline balance of the intestinal environment from the microbiome profile and patterns associated with its metabolic activity. This parameter helps to understand if the intestinal ecosystem favors healthy fermentation or if, on the contrary, it tends towards conditions that can facilitate microbial imbalances. It is not a direct measurement of pH, but an estimation based on microbial biomarkers.

Intestinal pH varies along the digestive tract and is influenced by diet, intestinal transit, hydration, drug use (e.g., antibiotics), and, very importantly, by the activity of the microbiota. In the colon, a lower pH is usually related to higher production of short-chain fatty acids (like butyrate) derived from fiber fermentation, which is often associated with a more favorable environment for beneficial bacteria. Conversely, a higher pH can appear when that fermentation decreases (e.g., low-fiber diets) or when the substrates available to bacteria change. Interpreted together with other results, it provides a useful insight into the functional state of the intestine.

This prediction can be integrated with other test indicators to offer a functional read of the microbiome: what “type of environment” it is promoting and how it might be affecting the stability of the intestinal ecosystem.

Intestinal pH influences key aspects of digestive and general well-being:

• Microbial balance and pathogen resistance: certain pathogens thrive better in specific pH ranges, and a less favorable environment can help curb their spread.
• Intestinal barrier integrity: an ecosystem that favors the production of metabolites such as butyrate is associated with energy support for colon cells and a more resilient barrier.
• Inflammation and digestive comfort: sustained changes in pH can reflect alterations in fermentation and metabolite profiles, with possible effects on gas, bloating, or transit irregularity.
• Metabolism of intestinal compounds: pH can modulate processes such as the transformation of bile acids and other compounds generated by the microbiota, which are related to metabolic and immune signals.

We use a highly accurate Shotgun metagenomics-based predictive model.

Our algorithm calculates a Functional Ecological Ratio. We map and quantify the total abundance of genes responsible for saccharolytic pathways (acetate, propionate, butyrate, and lactate production) and divide them by the abundance of proteolytic and deamination pathways (ammonia, putrescine, cadaverine production).

An optimal pH (5.5 - 6.5) reflects an ecosystem dominated by complex carbohydrate fermentation (MACs). This creates a highly protective environment. Conversely, a pH > 6.8 - 7.5+ reflects an ecosystem in a state of relative luminal alkalosis. Clinically, it suggests a diet excessively rich in animal proteins/fats without sufficient fiber compensation, or very slow intestinal transit (chronic constipation) which depletes carbohydrates and initiates putrefaction. Intervention requires drastically increasing prebiotics (FOS, GOS, resistant starch) to force re-acidification of the medium.