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Your test came back positive. What does that actually mean?
Your test came back positive. What does that actually mean?: a natural-frequency calculator is the core: enter prevalence, sensitivity and specificity and…
This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.
What this guide covers
A natural-frequency calculator is the core: enter prevalence, sensitivity and specificity and get "out of 1,000 people like you" drawn as icon arrays instead of percentages, because percentages are exactly what makes this go wrong.
Around it sit worked scenario pages with the published numbers already filled in — a rare-disease screen, prenatal NIPT, a workplace drug test, a "99% accurate" home kit, an antibody test after infection, a wearable's false alarm, and a screening mammogram at 45 versus 65 — each ending in the plain sentence about what the result changes. Fourteen scenario pages.
How to use it
Use Your test came back positive. What does that actually mean? as a structured learning path: begin with the vocabulary, follow the evidence map, and keep the uncertainty labels attached to claims as you compare sources.
The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.
Search vocabulary in four languages
Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.
| Language | Example phrase |
|---|---|
| Estonian | valepositiivse tulemuse tõenäosus |
| Finnish | väärä positiivinen tulos todennäköisyys |
| Russian | вероятность ложноположительного результата |
| English | if a test is 99 percent accurate what does a positive mean |
Evidence and provenance
The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.
Source: own computation; prevalence from national registries and published screening programme reports, test performance from cited primary studies. · checked 2026-09-09
Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.
Scope and boundaries
sibling to #215, which defines the terms; this one is the calculator and the cases, and it never tells anyone what their result means.
Connected TempoLife guides
The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.
Screening
Continue to the related TempoLife reference.
Checkup
Continue to the related TempoLife reference.
Blood Test
Continue to the related TempoLife reference.
Why it belongs on TempoLife
/screening, /checkup, /blood-test.
Frequently asked questions
What does this guide cover?
A natural-frequency calculator is the core: enter prevalence, sensitivity and specificity and get "out of 1,000 people like you" drawn as icon arrays instead of percentages, because percentages are exactly what makes this go wrong. Around it sit worked scenario pages with the published numbers already filled in — a rare-disease screen, prenatal NIPT, a workplace drug test, a "99% accurate" home kit, an antibody test after infection, a wearable's false alarm, and a screening mammogram at 45 versus 65 — each ending…
What evidence does it use?
own computation; prevalence from national registries and published screening programme reports, test performance from cited primary studies.
Where does this guide stop?
sibling to #215, which defines the terms; this one is the calculator and the cases, and it never tells anyone what their result means.
Turn the reference into a routine
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