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Understand Platelet-to-Lymphocyte Ratio (PLR)

Platelet-to-Lymphocyte Ratio (PLR)

Immunity & allergy markers

What the test generally measures, and what to ask about it.

Longetic keeps every lab and record you’ve had organized and easy to find, so your own Platelet-to-Lymphocyte Ratio (PLR) values sit together on one chart and you walk into your next appointment prepared.

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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.

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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.

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