Transparency
A figure in a paper has to survive the day the dataset behind it is revised. These are the rules the application keeps so that it does.
A published report never changes
Publishing a report freezes every line: the quantity, the dataset and its UUID, the method and impact category, the factor, its edition and extraction date, and the result. Later versions of the application, later editions of the background database and later corrections to a product do not touch a published version. A project can be published again as a new version; the old one stays readable, with its own figures and date.
Every line names its source
Each line of a report carries the dataset it was multiplied by, the method, the factor and where that factor came from (the database edition for materials; the paper for a drug). The Excel export holds every line with every column; the PDF the same lines grouped as the page shows them. The Standard report adds a document-control page with a SHA-256 fingerprint of the frozen figures, so that a copy can be checked against the version it claims to be.
Versions say whether figures are comparable
A MINOR version means the figures are not comparable with the previous one, because an emission factor or the report arithmetic changed. A PATCH means they are. Every report and export carries the software version, the catalogue edition and the method beside the figures.
What is deliberately not counted
Outside every report: the hospital building and its capital equipment, the manufacture of reusable instruments themselves, staff and patient travel, and care before and after the operation. Anaesthetic agents are counted as emitted, not as manufactured. Inside a report, anything that could not be characterised is listed by name under “What is not counted”, with the reason, rather than summed as zero.
Two ways of counting waste, never added
Since 2.5.0 an operation's waste is weighed and costed, one stream (all bags together). Per procedure: the weight in kg. Per hospital: one BAFU disposal dataset (the waste-management datasets are in the catalogue for that picker only) and the distance by road to the processor, with where both came from.
| Line | Formula |
|---|---|
| Disposal | mean kg over the weighed, non-excluded procedures × number of procedures × factor per kg of the disposal dataset |
| Transport to processor | that mass / 1000 × km → t·km × factor of Transport, freight, lorry, fleet average {CH} |
The mean is applied to every procedure so that the per-procedure figure is the mean of the weighed ones; the line says how many were not weighed and which weighings were excluded, with the reason given. Until the hospital has recorded its route, the report carries one line saying waste is not counted.
Waste per product (2.8.0), a second method beside the first. A component
can be marked "disposed as" a per-kg disposal dataset. Its own mass lines
(mass units only; since 2.10.0 not the process steps, see below), times its effective count down the product's tree, times
the units consumed, go to that dataset; the disposed mass then travels the
hospital's distance to the processor, as above. Components of consumed
products with a mass but no disposal are named on a "not covered" line. The
two methods describe the same waste and are never added. Since 2.11.0
the headline takes one basis per project (project_waste_basis): the
weighed bin when any procedure was weighed — the report then shows, beside
it, the waste per product, the total with it in place of the weighed waste,
and the difference (per product minus weighed, in the unit and as a share
of the weighed) — and otherwise the waste per product itself. Each published
version records its basis (report_publication.waste_basis). Jack,
2026-10-05: a project that weighs nothing left end of life out entirely; the
study expects weighing to come close to the full calculation at far less
effort, and the difference is the measure of that. The catalogue
has no latex, textile or infectious-waste dataset; rubber and plastics are
assigned to Disposal, plastics, mixture … to municipal incineration, and
infectious waste to Disposal, hazardous waste … to hazardous waste
incineration, as proxies.
Open questions
The questions the method review puts to the clinical team are collected in its last chapter: open questions. They are decisions about the model, not errors in the arithmetic, and the review says for each what the application does today.
Public links
A published report or comparison can be shared by a link that needs no account. Such a link serves one frozen version and nothing else; a withdrawn version answers nothing. Links can be revoked.