The science
Stool patterns, urine concentration, bathroom timing, and urinary flow. A record of everyday signals, built to help you understand your own patterns over time.
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Gut health patterns
- Stool form (Bristol Stool Scale)
- Stool color
- Estimated stool volume
- Frequency
- Regularity / time of day
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Hydration
- Estimated urine osmolality (urine concentration)
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Bathroom habits
- Time on toilet
- Time to first evacuation
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Urinary flow
- Estimated flow-rate curve
- Peak flow (Qmax)
- Average flow (Qavg)
Your gut has patterns. Tracking them shouldn’t be a chore.
Dietitians and GI doctors use food, symptom, and bowel diaries to spot patterns. But entries get missed, and details fade.
Who remembers last week’s bowel movements?
Throne makes bathroom logging automatic. Less time keeping records, more time connecting the dots.
Functional gut health
A shared language for stool.
The Bristol Stool Scale describes seven stool forms, from separate hard pieces to liquid stool. It gives observations a consistent vocabulary, useful alongside frequency, color, estimated volume, and time of day.
Tap a type
Type 4
Smooth and soft
Stool-form categories describe appearance. They are not a diagnosis.
How Throne records it
Throne uses images to classify stool form and color and estimate stool volume. Detected sessions provide frequency and timing. Missing or away-from-home sessions can leave gaps in the record.
How to interpret it
Compare several days with your own baseline and symptom notes. Stool form alone cannot diagnose IBS, IBD, inflammation, or a food intolerance. Color and volume also need context. Read the stool-form study.
Hydration
Urine concentration, estimated.
Osmolality describes the concentration of dissolved particles in a fluid. A laboratory measures it in a urine sample; Throne estimates it from optical urine-color analysis.
Drag the color
Estimated urine concentration
In between
- Optical urine-color signal
- Algorithmic estimate
- Estimated urine osmolality (mOsm/kg)
Urine concentration is one signal. This is not a direct laboratory measurement or a complete hydration assessment.
How Throne records it
The optical signal is an input to a model, not a direct laboratory assay. Estimated urine osmolality can help track urine-concentration trends across recorded visits.
How to interpret it
Urine concentration varies with fluid intake, time of day, diet, medicines, and kidney function. It is not a complete measure of whole-body hydration. Color can also be affected by pigments and the conditions in the bowl. Read research on urine color and osmolality.
Bathroom habits
Timing adds another dimension.
Time on toilet describes a whole session. Time to first evacuation describes the interval between the detected start of a seated session and the first detected evacuation.
Drag through the session
Time to first evacuation
Time on toilet
Schematic only. Event spacing does not represent typical or recommended times.
How Throne records it
Throne derives these intervals from detected session events. A visit with no detected evacuation does not provide a time-to-first-evacuation value; it should not be read as an immediate evacuation.
How to interpret it
A shorter or longer interval may provide context for urgency or difficulty passing stool, but timing alone does not measure either symptom. Distraction, deliberate waiting, and missed events can change the result. Pair timing with your own symptom notes.
Urinary flow
A view of lower urinary tract function.
A flow-rate curve shows how urine flow changes during a void. Peak flow (Qmax) is the highest rate; average flow (Qavg) summarizes flow over the time urine is flowing.
Drag along the curve
100%of peak flow · this is Qmax
Illustrative curve, not a patient reading or a normal range. Qavg is voided volume divided by flow time.
How Throne records it
Throne uses acoustic analysis of standing sessions to estimate a flow-rate curve, Qmax, and Qavg. These are model-derived estimates, distinct from a clinical uroflowmeter’s measurements.
How to interpret it
Flow depends on the bladder, outlet resistance, voided volume, and testing conditions. A low peak cannot identify a prostate problem or distinguish obstruction from a weak bladder contraction. Repeated, representative voids and clinical context matter. Read the EAU guidance on uroflowmetry.
How to read the numbers
Three steps, with different kinds of uncertainty.
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Measurement.
The sensor records optical and acoustic signals and event timing. Whether a session or evacuation is detected affects the resulting record.
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Estimation.
Algorithms use those signals to classify stool form and color and estimate volume, urine osmolality, and urinary flow. An estimate can differ from a reference measurement.
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Interpretation.
Trends help you compare visits and add context to symptom and food notes. They do not establish a diagnosis or prove why a pattern changed.
Scientific Advisory Board
Guided by the people who wrote the guidelines.
Our advisors include the lead authors of clinical guidelines for ulcerative colitis, SIBO, and colorectal cancer screening.
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Dr. David Rubin
Lead author, ulcerative colitis guidelines · UChicago Medicine -
Dr. Suzelle Moffitt
Four decades of patient care · Clinical advisor -
Dr. Vipul Jairath
IBD clinical-trial leader · Western University -
Dr. Satish Rao
Pioneer in constipation treatment · Augusta University -
Dr. Mark Pimentel
Lead author, SIBO guideline · Cedars-Sinai -
Dr. Fola May
Colorectal cancer prevention and health equity · UCLA -
Dr. Aasma Shaukat
Lead author, colorectal cancer screening guidelines · NYU Langone
Research
Research & references.
In progress
Validation studies are in progress. Throne is working with researchers on validation studies. We’ll share formal results once they’re cleared for publication.
Background research, not Throne-specific validation. These sources explain the measurements, their use, and their limits.
Bowel, food, and symptom diaries5
Wright-McNaughton et al. Validation of the Food and Symptom Times diary. Clinical and Translational Gastroenterology, 2019.
Academy of Nutrition and Dietetics. Irritable Bowel Syndrome. Guidance on food diaries and identifying food-related symptom patterns. Published 2022; reviewed 2026.
Lackner et al. The accuracy of patient-reported measures for GI symptoms: a comparison of real time and retrospective reports. Neurogastroenterology & Motility, 2014.
Stone et al. Patient non-compliance with paper diaries. BMJ, 2002. A study of scheduled chronic-pain diary entries.
Stool form1
Lewis & Heaton. Stool form scale as a useful guide to intestinal transit time. Scandinavian Journal of Gastroenterology, 1997.
Urine concentration1
Criterion values for urine-specific gravity and urine color representing adequate water intake in healthy adults. European Journal of Clinical Nutrition, 2017.
Urinary flow1
European Association of Urology: diagnostic evaluation of male lower urinary tract symptoms. See the uroflowmetry section; guidance checked September 2026.

Start with your everyday patterns.
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