Platelet-to-Lymphocyte Ratio (PLR)
Platelet-to-lymphocyte ratio: platelet count / absolute lymphocyte count, reported against a healthy reference interval of 46.8-218.0; there is no validated general cut-off.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Platelet count
- 300 ×10⁹/L
- Absolute lymphocyte count
- 1.5 ×10⁹/L
Result: Platelet-to-lymphocyte ratio 200 — within the healthy reference interval (46.8-218.0).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 46.8-218.0
- Within the healthy reference interval: mean 132.4, interval mean ± 1.96 SD, measured in 12,160 adults (Lee 2018).
- Outside 46.8-218.0
- Outside that interval. PLR = platelets / ALC, an inflammatory / prothrombotic marker.
- No general cut-off
- A reference interval, not a diagnostic threshold. The review reports cut-offs of 124.63 in Behcet disease, 183.39 in Takayasu arteritis and 272 in ANCA vasculitis, and says one does not carry over.
What you enter
- Platelet count
- Absolute lymphocyte count
How this is calculated
Gasparyan AY, Ayvazyan L, Mukanova U, Yessirkepov M, Kitas GD. The platelet-to-lymphocyte ratio as an inflammatory marker in rheumatic diseases. Ann Lab Med. 2019;39(4):345-357. Healthy reference interval: Lee JS, Kim NY, Na SH, Youn YH, Shin CS. Medicine (Baltimore). 2018;97(26):e11138. Read the sources: Gasparyan 2019 (the marker) ↗, Lee 2018 (reference interval) ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.