For clinicians · Free · Nothing leaves your device
Fever is a sign. Find its cause.
Three taps: where the patient is, any danger sign, and the area the fever points to. You get one place to start, the next test, and the evidence behind it.
1Where is the patient
2Any danger sign?
3Where does it point? Open an area
The read
How it works
A compass, not a calculator
Danger first
Neutropenia, possible sepsis, meningitis, travel from a malaria area, a hyperthermia syndrome or a transfusion come before any ranking and say what to do now. Each comes from a guideline.
One place to start
The best fit is shown on its own with the next test. Everything else waits under “also consider”, split into infections and causes that are not infection.
Honest about numbers
Published likelihood ratios exist for only a few causes of fever, so the order is an editorial weighting, never a percentage. Untapped means unknown, not absent.
Covers causes of fever in adults. Not for children or pregnancy. It does not replace examination, local protocols or senior advice, and it is not a medical device.
Test bench
How it does on written cases
These vignettes were written by the same author who set the weights, so a high score shows the ranking does what it was designed to do. It is not evidence of accuracy on real patients; that needs an independent set of cases, which is the next step. The table is computed live in your browser from the current version.
| Vignette | Expected | Compass ranks first | Result |
|---|
Sources
Every statement names one of sources
About
Written by a clinician, for clinicians
Fever Compass is part of The Tract, a free and independent neurology library with no ads and no sign-up. It was written by Dr Mohamed Najm, a neurologist in neurocritical care and neurological emergencies, and drafted with AI assistance. Every clinical statement names its source, so you can check it yourself.
It is a teaching and orientation tool for clinicians, not a medical device and not a substitute for clinical judgement. Nothing you tap leaves your device. Corrections are welcome at contact@thetract.org.
Version · reviewed
What changed