---
title: "Mass accuracy: research glossary | Sable Peptides"
description: "Mass accuracy is the difference between the measured and the theoretical mass of an ion, often expressed in parts per million (ppm). High-resolution instru"
canonical: https://www.sablepeptides.co.uk/glossary/mass-accuracy
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Mass accuracy

Mass accuracy is the difference between the measured and the theoretical mass of an ion, often expressed in parts per million (ppm). High-resolution instruments routinely achieve accuracy within a few ppm, which greatly narrows the possible elemental compositions and increases confidence in peptide identity confirmation.

Source: [en.wikipedia.org](https://en.wikipedia.org/wiki/Mass_spectrometry)

## Related terms

-   [Peptide](/glossary/peptide)
-   [Resolution](/glossary/resolution)
-   [Parts per million](/glossary/parts-per-million)
-   [Accuracy](/glossary/accuracy)

[Back to glossary A–Z](/glossary/terms)

All Sable Peptides products are supplied for laboratory research use only. Not for consumption.