---
title: “SPIN and SNOUT” in screening
description: "Mnemonic for ‘Specific test when Positive rules IN the disease’ and ‘Sensitive test when Negative rules OUT the disease’. Though this is very much a function of the prevalence of the problem. See detail in [glossary entry about screening](https://www.psyctc.org/psyctc/glossary2/screening/) and…"
url: "https://www.psyctc.org/psyctc/glossary2/spin-and-snout-in-screening/"
updated: "2023-08-23"
category: All OM book glossary entries
---

# “SPIN and SNOUT” in screening

Mnemonic for ‘Specific test when Positive rules IN the disease’ and ‘Sensitive test when Negative rules OUT the disease’. Though this is very much a function of the prevalence of the problem. See detail in [glossary entry about screening](https://www.psyctc.org/psyctc/glossary2/screening/) and [go and play with the app](https://shiny.psyctc.org/apps/Screening/) and see that for numbers you choose.