Understand Platelet-to-Lymphocyte Ratio (PLR)

Platelet-to-Lymphocyte Ratio (PLR)

Here’s what it reflects — and what to do about it.

Longetic pulls together every lab and record you’ve had, follows how Platelet-to-Lymphocyte Ratio (PLR) changes over time, and explains what’s shifting — so you walk into your next appointment prepared, with reminders for retests along the way.

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Updated Jul 13, 2026

What is Platelet-to-Lymphocyte Ratio (PLR)?

A calculated ratio comparing platelets to lymphocytes, used as a marker of inflammation.

This is a calculated value from a routine CBC: it divides your platelet count by your lymphocyte count. A higher PLR can be associated with more systemic inflammation, and is most informative alongside related indices like the neutrophil-to-lymphocyte ratio. It is a general, non-specific signal rather than a diagnosis.

What to know about Platelet-to-Lymphocyte Ratio (PLR)

Understanding Platelet-to-Lymphocyte Ratio (PLR) means knowing what it reflects, what tends to move it, and the signs that suggest it’s worth a closer look — so you can bring the right questions to your next appointment.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Medical Disclaimer.

References

Official source "The Platelet-to-Lymphocyte Ratio as an Inflammatory Marker (Gasparyan, Ann Lab Med 2019)" PubMed. pubmed.ncbi.nlm.nih.gov/30809980.

About our sources

Clinical / professional

Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.

Peer-reviewed research

Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.

History of updates

Published · Jul 13, 2026
First published, calculated index, formula + sources independently fact-checked.

Track your Platelet-to-Lymphocyte Ratio (PLR) over time with Longetic

Upload a lab, and Longetic reads it, explains it, and reminds you when it's time to re-check — so nothing slips between visits.