urine
Enable an AI agent to recognise urine, assess the condition and evidential limits of a particular quantity, and determine suitable collection, testing, handling or disposition actions.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 18 findings · 28 questions
Urinary identity Establishes what qualifies the material as urine and where that identity becomes uncertain.
Biological origin
Connects the material to a producing organism and urinary origin.
Evidence of urinary origin
Record the evidence for biological urinary origin and its limitations.
- What evidence establishes that this material originated from urinary excretion? definition
- Which organism, species or pooled source produced it, and how securely is that association documented? provenance
Mixtures and derivatives
Separates native urine from substitutes, admixtures and processed fractions.
Boundary of the urine material
Record additions, separations and transformations that affect what the quantity should be called.
- Is this native urine, a urine-containing mixture, a separated fraction or a synthetic preparation? boundary
- What additions or processing steps are known, and which component proportions remain unknown? provenance
Collection and representation Defines how the urine was obtained and what period or source the collected quantity represents.
Collection circumstances
Records the route and circumstances through which urine entered the collection.
Collection route and context
Capture circumstances that may affect composition or introduce other material.
- Was the urine voided, obtained through a catheter or procedure, or recovered after contact with another surface? provenance
- Which relevant circumstances, such as collection timing, fluid intake or medication exposure, are documented rather than assumed? provenance
Quantity and coverage
Distinguishes collected amount from the excretion interval it may represent.
Collection completeness
Record measured volume and whether the collection captures its intended interval or fraction.
- What urine volume was measured, by what method, and over what collection interval if any? measurement
- Were any voids, portions or transfers missed, spilled or excluded, and how does that limit representativeness? boundary
Urine properties and constituents Records observable condition and measured composition without inferring an organism's diagnosis.
Physical and chemical condition
Captures appearance, acidity and concentration indicators at a stated time.
Bulk property observations
Record bulk properties together with observation conditions and measurement methods.
- What colour, clarity, sediment or other visible features were observed, and when relative to collection? measurement
- What pH, specific gravity or osmolality results are available, with units where applicable and methods? measurement
Dissolved and particulate content
Describes measured chemicals, cells, crystals, casts and microorganisms.
Constituent evidence
Separate direct analytical results from inferred presence, absence or biological significance.
- Which dissolved constituents, cells, crystals, casts or microorganisms were examined, and what results and analytical limits were reported? measurement
- Which conclusions about constituent origin or significance require a linked assay or organism model? boundary
Post-collection integrity Tracks how urine changes or acquires extraneous material between collection and use.
Storage and preservation
Records conditions that may preserve or alter particular urine properties.
Preservation and exposure history
Maintain a time-linked history of storage conditions and deliberate preservation.
- What elapsed times, temperatures, light exposures and freeze-thaw events occurred before observation or testing? provenance
- Which preservatives or other additives were introduced, in what amounts and for which intended measurements? provenance
Contamination and change
Distinguishes possible collection contamination from constituents present at excretion and later alterations.
Evidence of compromised integrity
Record suspected contamination or alteration with evidence and unresolved alternatives.
- What evidence indicates admixture, dilution, evaporation, microbial change or precipitation after collection? measurement
- Can observed blood, cells, microorganisms or foreign chemicals be attributed to the original urine, collection contamination or later change? boundary
Use and disposition Connects the urine's documented condition to a specific proposed use and subsequent handling.
Purpose-specific suitability
Assesses whether provenance, amount and condition meet an intended use's requirements.
Acceptance for intended use
Link suitability decisions to explicit requirements and the evidence available.
- Which test or process is proposed, and what requirements does it impose on urine collection, volume, container and preservation? action
- Does this quantity meet those requirements, or is recollection, additional evidence or a qualified result needed? action
Handling and final route
Records constraints on transferring, processing, retaining or disposing of the urine.
Permitted material actions
Determine the next material action from intended purpose, known contents and applicable requirements.
- What handling constraints follow from the urine's source, suspected biological hazards, chemical contents or added preservatives? action
- Which authorised route applies next: testing, retained storage, treatment, reuse or disposal, and what conditions must be met? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these kinds and varieties hold for the sense of urine this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these identifiers and schemes hold for the sense of urine this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these standards and regulation hold for the sense of urine this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these real-world use hold for the sense of urine this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these typical measurements hold for the sense of urine this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these failure modes and hazards hold for the sense of urine this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these regional variation hold for the sense of urine this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of urine this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
- Other names and narrower kinds
- human urine, Gomutra, Camel urine, Aqua omnium florum
What it is Filled
Urine is the aqueous excretory fluid produced by the kidneys of many animals through processes that vary by species and can include glomerular filtration, tubular reabsorption and secretion; it consists mainly of water with dissolved salts and metabolic wastes whose composition varies by species and physiological state, and may be stored in a urinary bladder where one is present before excretion.
In scope
- Identity of urine and boundaries between native urine, mixtures, derivatives and synthetic substitutes
- Producing organism and circumstances relevant to interpreting a particular quantity
- Measured physical properties, constituents and observations
- Collection, storage, preservation, contamination and changes after collection
- Fitness and constraints for testing, handling, reuse or disposal
Out of scope
- Anatomy and function of kidneys, bladder and the urinary tract
- Diagnosis, treatment and overall health state of the producing organism
- Design and operation of catheters, collection vessels and analytical instruments
- Complete laboratory assay protocols and clinical interpretation rules
- Wastewater treatment systems, fertilizer products and environmental receiving systems
Why it exists Filled
Enable an AI agent to recognise urine, assess the condition and evidential limits of a particular quantity, and determine suitable collection, testing, handling or disposition actions.
Distinguishing features Filled
- Establish whether the material was produced through an organism's urinary excretion pathway; colour and smell alone do not establish urine identity.
- Distinguish native urine from synthetic urine using documented biological origin or preparation history; matching selected chemical measurements is insufficient.
- Distinguish urine from other bodily fluids using collection location, collection procedure and supporting analytical evidence, recording uncertainty when provenance is missing.
- Determine whether the quantity is urine alone or a mixture containing wash water, faeces, blood, cleaning agents or other materials; preserve the identity of added components.
- Distinguish whole urine from isolated urinary constituents, dried residues and processed derivatives by recording separation and transformation history.
What robots and AI may and may not do Filled
Must not
- Test a person's urine without their consent or a lawful basis.
- Share urine test results, such as drug or pregnancy tests, beyond the person and those entitled to them.
- Interpret a test result as a diagnosis for a specific person.
- Tamper with or swap samples.
Only with a human decision
- Ordering or reporting workplace or legal drug tests.
May
- Explain urine's composition and its use in medical testing from reliable sources.
- Handle urine samples following hygiene and chain-of-custody rules.
Moral aspects Filled
- Urine tests reveal intimate health and drug-use information.
- Collection can be degrading if done without dignity.
Who is affected
- People tested
- Patients
- Laboratory staff
Owners Filled
Steward
The person it came from; laboratories hold samples and results in custody.
Master systems
- Laboratory information systems
Links to other meta-models Filled
parent
- Q1058795 - registry parent class
- Q112826975 - registry parent class
- Q1383944 - registry parent class
- Q19388114 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.urine
- Wikidata: Q40924 (https://www.wikidata.org/wiki/Q40924)
Direct properties required Filled
- Biological origin: Producing organism or species reference; unknown; pooled sources
- Material identity: Native urine; urine-containing mixture; urine-derived fraction; synthetic substitute; unresolved
- Quantity and collection interval: Volume in mL or L; collection start and end times; completeness assessment
- Collection route: Voided; catheter sampling; direct procedural collection; environmental recovery; other documented route; unknown
- Appearance: Observed colour, clarity, sediment, foam and observation conditions
- Acidity: pH with method, temperature where relevant and measurement time
- Concentration indicators: Specific gravity, dimensionless; osmolality in mOsm/kg; method and measurement time
- Constituent profile: Named analyte or particle, result, unit, method, detection limits and measurement time
- Preservation history: Elapsed time, temperature history, additives, light exposure and freeze-thaw events
- Fitness for intended use: Unassessed; suitable; conditionally suitable; unsuitable; indeterminate, linked to purpose and acceptance criteria
Recognition required Filled
- Fresh human urine is commonly clear and pale yellow to amber, although appearance varies with concentration and other factors.
- Urine ordinarily flows as a watery liquid, but this appearance cannot distinguish it reliably from other fluids.
- Cloudiness, unusual coloration or foam can occur, but none independently establishes identity or a diagnosis.
Capabilities and actions required Filled
- Collect and label a discrete specimen or timed collection with its provenance and completeness.
- Observe, measure and compare properties using methods appropriate to the intended question.
- Divide, preserve or transport aliquots while maintaining their relationship to the original quantity.
- Assess contamination, alteration and suitability against the requirements of a specified test or process.
- Route the material to authorised testing, processing, reuse or disposal under applicable handling requirements.
Hazards and failure modes required Filled
- Urine contaminated with infectious organisms can present an exposure risk during collection and handling.
- Misidentified, contaminated or degraded samples can produce misleading results and inappropriate decisions.
- Spilled urine can create slipping hazards and contaminate nearby surfaces.
- Urine testing can reveal sensitive health or exposure information whose unauthorized disclosure harms privacy.
Standards and interfaces required Filled
- ISO 15189, issued by the International Organization for Standardization, sets quality and competence requirements for medical laboratories examining urine samples.
Context of use required Filled
- Urine is encountered during animal excretion, sanitation, clinical care and biological research.
- Collected samples support assessment of kidney function, metabolic conditions and exposure to substances, with interpretation dependent on collection conditions and testing methods.
Sources Filled
- Guyton and Hall Textbook of Medical Physiology (urine formation, renal concentrating mechanism, micturition) - Physiological definition, daily volume, osmolality and pH ranges, and the distinction between glomerular filtrate and final urine.
- GP16: Urinalysis - Approved Guideline - Clinical collection kinds (random, first-morning, timed, midstream, catheter, suprapubic), specimen handling, and routine physical/chemical/microscopic measurements.
- European urinalysis guidelines - European laboratory practice for collection, particle analysis, and interpretation of dipstick and sediment findings.
- Guidelines for the Safe Use of Wastewater, Excreta and Greywater, Volume 4: Excreta and Greywater Use in Agriculture - Agricultural reuse of source-separated urine, pathogen and chemical hazards, and regional sanitation practice.
- Mandatory Guidelines for Federal Workplace Drug Testing Programs - Urine as a regulated forensic specimen; validity tests that separate urine from water or adulterated substitutes (creatinine, specific gravity, temperature).
- International Standard for Testing and Investigations - Observed urine collection for anti-doping, chain of custody, and sample-splitting practice.
- Wikidata item Q40924: urine - identity and sense of the item
- Wikipedia: Urine - general description of the item
Open questions
- Does the registry intend urine to cover all producing species, including excretions in which urinary and faecal components are normally combined?
- At what degree of admixture or processing should a material become a linked mixture or derivative rather than an instance of urine?
- Which source-backed, assay-specific criteria should govern acceptable collection, storage, preservation and rejection?
- What evidence is sufficient to classify material of uncertain origin as urine, and how should conflicting provenance and analytical evidence be represented?
- Which intended uses must the first researched model support: clinical testing, research, environmental assessment, resource recovery or others?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q40924/spec.json