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Understand Platelet-to-WBC Ratio (PWR)

Platelet-to-WBC Ratio (PWR)

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-WBC Ratio (PWR) 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-WBC Ratio (PWR)?

A calculated ratio comparing platelets to the total white-blood-cell count.

This is a calculated value from a routine CBC: it divides your platelet count by your total white blood cell count. It is explored as a marker of the balance between clotting cells and immune cells, changes can be associated with inflammatory or infectious states. It is a broad, non-specific signal and not a diagnosis.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.

References

Official source "CBC-derived inflammatory ratios (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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