This system is based on clinically observed correlations and does not provide medical diagnosis.
Our application uses a weighted algorithmic approach to evaluate your digestive well-being. By analyzing physiological markers and sensory data, we provide a 10-point scale reflecting your current gastrointestinal status. Our methodology is rooted in international clinical standards. We primarily base our assessment on the Bristol Stool Form Scale (BSFS), originally developed by Lewis & Heaton and later validated in modern multicenter studies by Saad et al. , confirming its high accuracy in predicting intestinal transit time. Furthermore, we align our metrics with the World Gastroenterology Organisation (WGO) Global Guidelines (2025) for a comprehensive evaluation of gut function.
Want the type-by-type breakdown first? See the Bristol Stool Chart or the Stool Color Guide.
Scenario 1: Defecation Occurred
When you record a bowel movement, the algorithm evaluates five core dimensions of digestive efficiency:
1. Stool Consistency (The Bristol Scale)
We use the Bristol Stool Form Scale (BSFS), a medical aid designed to classify the form of human faeces into seven categories.
- Optimal (Types 3 & 4): These are considered the "gold standard" for a healthy gut, indicating proper transit time and hydration. (No deduction)
- Constipation (Types 1 & 2): Points are deducted (-2 to -4) as these indicate slow transit time and potential dehydration.
- Diarrhea/Urgency (Types 6 & 7): Significant deductions (-2 to -4) are applied due to rapid transit and malabsorption risks.
2. Color Indicators
Stool color is a clinically relevant indicator of gastrointestinal and hepatobiliary health. According to peer-reviewed medical literature, normal brown coloration is primarily due to stercobilin, a bile pigment derived from hemoglobin metabolism.
- Normal (Brown): Indicates proper bile production and intestinal processing.
- Pale/White (Acholic Stool): May indicate reduced or absent bile flow, commonly associated with biliary obstruction or liver disease.
- Black (Melena): Typically suggests upper gastrointestinal bleeding, where blood is digested as it passes through the GI tract.
- Red (Hematochezia): Indicates lower gastrointestinal bleeding, as defined in clinical guidelines from the British Society of Gastroenterology.
- Critical Colors: White (pale), Black (tarry), or Red (bloody) stools trigger a significant deduction (-7 points) and an immediate recommendation to consult a physician, as these can indicate biliary obstruction or GI bleeding.
See the full breakdown on the Stool Color Guide.
3. Subjective Comfort & Sensation
The physical experience of defecation is a key indicator of pelvic floor and rectal health.
- Pain or Incomplete Evacuation: Deductions (-1.5 to -5) are applied for painful processes, which may correlate with hemorrhoids, fissures, or dyssynergic defecation (Source: PubMed/NCBI).
4. Odor and Abdominal Feel
While odor is natural, "putrid" or "extremely sharp" smells can indicate malabsorption or fermentation issues. Likewise, any pre-existing abdominal discomfort reduces the score by up to 2 points.
Scenario 2: No Defecation (Gas Analysis)
If no bowel movement occurred, the system pivots to evaluate Intestinal Gas Dynamics. Flatulence is a normal byproduct of digestion, but its frequency and odor provide clues about your microbiome.
- Odor Profile: Neutral or standard gas is normal. Strong "sulfuric" or "rotten" odors can suggest high protein fermentation or sensitivities to certain food groups (FODMAPs). High intensity reduces the score by up to 3 points.
- Frequency: While the average person passes gas 13–21 times a day, "excessive" frequency combined with discomfort can indicate bacterial overgrowth or maldigestion.
- General Abdominal Feeling: In the absence of stool, feelings of bloating or "heaviness" become the primary indicators of gut tension.
Score Interpretation
| Score | Status | Description |
|---|---|---|
| 9 – 10 | Excellent | Your digestive system is functioning optimally. |
| 6 – 8 | Good | Minor deviations, likely due to temporary diet or stress factors. |
| 3 – 5 | Attention Needed | Signs of imbalance. Consider increasing hydration and fiber intake. |
| 0 – 2 | Imbalance | Your gut is signaling a clear disruption in its normal rhythm. |
IMPORTANT: If you receive a "Critical" alert or have a score below 3 consistently, we recommend consulting a gastroenterologist. This tool is for educational tracking and does not replace professional medical advice.
Analytics Score Calculation (Time-Based)
In the Analytics section, your digestive health score is calculated over a selected period (such as 3 days, a week, or a month). This score reflects not just individual events, but your overall digestive patterns.
First, the system calculates the average score of all recorded bowel movements during the selected period. This represents the overall quality of digestion.
Next, the system evaluates how often bowel movements occur. Both very infrequent and excessively frequent patterns may indicate imbalance, so this factor helps adjust the score accordingly.
The system also considers how evenly bowel movements are distributed across days. Consistent, regular patterns are associated with healthier gastrointestinal function, while irregular patterns may lower the score.
The final result is calculated by combining:
- the average quality of each event,
- how frequently they occur,
- and how consistent they are over time.
- 15: Indicates a significant imbalance and potentially poor digestive health.
- 100: Reflects optimal digestive function and highly consistent, healthy patterns.
This approach reflects both how well your digestive system functions and how stable it is over time, providing a more complete picture of gut health than a single measurement.
Scientific References
- The Foundation: Lewis, S. J., & Heaton, K. W. (1997). Stool form scale as a useful guide to intestinal transit time. Scandinavian Journal of Gastroenterology. [PubMed]
- Clinical Validation: Saad, R. J., et al. (2010). Do stool form and frequency correlate with whole-gut and colonic transit? American Journal of Gastroenterology. [PubMed]
- Global Standards: World Gastroenterology Organisation (2025). Global Guidelines on Chronic Constipation. [WGO]
- Stool color: Mayo Clinic: Clinical health information on digestive symptoms. [Mayo Clinic]
- Lower GI Bleeding Guidelines: Oakland, K. et al. (2019). Diagnosis and management of acute lower gastrointestinal bleeding. [PubMed]
- Stool color: Aoyama T. et al. "Bile pigment in small-bowel water content..." (2020, PubMed Central). [PubMed]
- Lower gastrointestinal bleeding: Ashley Bond. et al., British Society of Gastroenterology. [PubMed]
- Anorectal Disorders for Gastroenterologists: Adil E. Bharucha et al., "Anorectal Disorders", American Gastroenterological Association. [AGA]
- Intestinal Gas Research: Levitt, M. D. (1971). Volume, composition, and source of intestinal gas. [AGA]
- Bowel movement frequency and regularity: Susanna A Walter et al., Assessment of normal bowel habits [PubMed]