Utility tools
One page, two tabs: /tools/calculators and /tools/document-scanner.
Calculators
Two, both built in:
| Calculator | Formula |
|---|---|
| Corrected calcium (albumin-adjusted) | corrected = total + 0.02 × (40 − albumin) |
| Anion gap (without potassium) | gap = Na − (Cl + HCO₃) |
Both print their convention beside the number, because both differ between sites. The 40 g/L reference and the 0.02 factor are laboratory-specific, and the two anion-gap conventions differ by about 4 mmol/L — most of the reference interval — so the convention is stated rather than assumed.
Units are labelled on every field for the same reason: a creatinine in µmol/L put through an mg/dL equation gives a plausible, wrong answer.
There is no "save to record" button, and there will not be one
A calculated value has no specimen, no method and no quality control behind it. Filed into a patient record it would sit beside measured results and look exactly like one — and a delta check would then compare a real measurement against an arithmetic estimate.
If a laboratory reports a calculated quantity, it is defined as a calculated test on the panel, ordered, and produced through the same result pipeline as everything else.
Document scanner
For requisitions, consent forms and referral letters. JPEG, PNG or PDF, up to 5 MB, at least 1000 × 640, with the whole requisition in frame including the clinician's signature.
Both limits refuse for a reason the page states:
- Too large — a photograph at full phone resolution. A flatbed scan or a PDF is smaller and far easier to read.
- Too small — a requisition photographed from across a desk loses the handwriting long before a person notices, so it is refused here rather than filed unreadable.
A scan is attached to a patient (by medical record number) or an order (by the accession printed on the specimen label — not the order number, because an order can carry several specimens and the document belongs to one of them). A reference this laboratory does not hold is refused: a scan filed against the wrong patient is found by an audit, not by the person who filed it.
The page itself stores nothing. The scan is attached through the record that owns it, which is where the retention rule and the audit entry live. A scanner that filed documents on its own would create records nobody could later account for.