Immune and inflammation
Platelet-to-lymphocyte ratio (PLR)
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Compare membershipsAnother view of inflammation from your blood count.
PLR is calculated by dividing your platelet count by your lymphocyte count. Researchers study it as a marker of inflammation, though its use in everyday care is still limited.
Most of what we know comes from research studies.
Platelets tend to rise and lymphocytes tend to fall during inflammation, so PLR can climb when either one changes. Studies have explored it in rheumatic diseases, heart disease, and cancer, mostly in people who are already unwell.
Results vary between studies and labs, and there's no standard reference range. Reviews suggest PLR is most informative when read alongside NLR and other markers of inflammation.
Questions
Where does my PLR come from?
It's calculated from two results already in your complete blood count: your platelet count and your lymphocyte count. No extra sample is needed.
Should I act on a high PLR?
A high PLR on its own isn't a reason for alarm. It's worth checking which part changed (platelets, lymphocytes, or both) and looking at hsCRP and NLR. A clinician can help decide whether anything needs follow-up.