CBC / Differential Calculator & Workspace
Enter one CBC/differential record to calculate available five-part white-cell absolute counts plus NLR, PLR, LMR, and SII with explicit source provenance.
Content updated: View sources
QuickMedCalc is developed and maintained by an independent developer. Medical content is not independently reviewed by a physician.
Formula and medical content are based on the references listed on this page. See sources, About, and Sources and Review Process.
About
Enter one CBC/differential record to obtain the available five-part absolute counts and CBC-derived ratios using existing validated arithmetic engines. Outputs retain reported-versus-calculated provenance; missing values are never invented. NLR also supports matched reported neutrophil and lymphocyte percentages without WBC. [1, 3, 4, 6, 7, 9]
This arithmetic does not reproduce analyzer measurement, flow cytometry, smear review, morphology assessment, instrument flags or laboratory reference intervals, and does not replace laboratory interpretation. CBC-derived ratios vary with population, disease, sampling time, medicines and study purpose; no universal diagnostic or prognostic categories or treatment recommendations are applied. [2, 5, 8]
Formula
Interpretation
Laboratory context remains primary
Use the reporting laboratory’s absolute counts, reference intervals, analyzer flags, smear findings, specimen details, and collection time. A calculated value does not replace a reported absolute count or establish why a cell population is high or low. [2, 5]
No universal disease / ratio categories
Published ANC, eosinophilia, NLR, PLR, LMR and SII thresholds belong to specific laboratory, disease and study frameworks, not universal categories. [8, 10, 11]
References
- Brereton M, McCafferty R, Marsden K, et al. Recommendation for standardization of haematology reporting units used in the extended blood count. Int J Lab Hematol. 2016;38(5):472–482. DOI 10.1111/ijlh.12563.
- Briggs C, et al. ICSH guidelines for the evaluation of blood cell analysers including those used for differential leucocyte and reticulocyte counting. Int J Lab Hematol. 2014;36(6):613–627. DOI 10.1111/ijlh.12201.
- Hedley BD, Keeney M, Gambell P, et al. White Blood Cell Enumeration and Differential by Flow Cytometry: The ICSH WBC Reference Method. Int J Lab Hematol. 2026;48(1):93–101. First published September 11, 2025. PMID 40936290. DOI 10.1111/ijlh.14553.
- MedlinePlus. Blood Differential. U.S. National Library of Medicine.
- Tefferi A, Hanson CA, Inwards DJ. How to Interpret and Pursue an Abnormal Complete Blood Cell Count in Adults. Mayo Clin Proc. 2005;80:923–936. PMID 16007898. PMCID PMC7127472. DOI 10.4065/80.7.923.
- Zahorec R. Ratio of neutrophil to lymphocyte counts—rapid and simple parameter of systemic inflammation and stress in critically ill. Bratisl Lek Listy. 2001;102(1):5–14. PMID 11723675.
- Gasparyan AY, Ayvazyan L, Mukanova U, et al. The Platelet-to-Lymphocyte Ratio as an Inflammatory Marker in Rheumatic Diseases. Ann Lab Med. 2019;39(4):345–357. PMID 30809980. PMCID PMC6400713. DOI 10.3343/alm.2019.39.4.345.
- Luo H, et al. Normal Reference Intervals of NLR, PLR, LMR, and SII in Healthy Adults: a Large Multi-Center Study from Western China. Clin Lab. 2019;65(3). PMID 30868857. DOI 10.7754/Clin.Lab.2018.180715.
- Hu B, et al. Systemic immune-inflammation index predicts prognosis of patients after curative resection for hepatocellular carcinoma. Clin Cancer Res. 2014;20(23):6212–6222. PMID 25271081. DOI 10.1158/1078-0432.CCR-14-0442.
- MedlinePlus Medical Encyclopedia. Eosinophil count—absolute. Reviewed January 28, 2025.
- Valent P, Klion AD, Roufosse F, et al. Proposed refined diagnostic criteria and classification of eosinophil disorders and related syndromes. Allergy. 2023;78(1):47–59. PMID 36207764. PMCID PMC9797433. DOI 10.1111/all.15544.
FAQ
The shared record supports ×10⁹/L, ×10³/µL (K/µL), and cells/µL. ×10⁹/L and ×10³/µL are numerically equivalent but the selected reporting identity remains visible.
Sources: [1]
No. WBC is required before the workspace can derive an absolute differential count from a reported percentage. Missing WBC is never inferred, and missing cell populations are never treated as zero.
NLR can use matched reported neutrophil and lymphocyte percentages directly, or established absolute neutrophil and lymphocyte counts. PLR requires platelets and absolute lymphocytes; LMR requires absolute lymphocytes and monocytes; SII requires platelets plus absolute neutrophils and lymphocytes. Each absolute count may be reported or calculated from WBC and its reported differential percentage.
No. Laboratory intervals and study cutoffs vary by population, condition, method, and purpose. The workspace applies no universal diagnostic, severity, prognostic, or treatment category.
Sources: [8]
No. After the existing runtime normalizes counts to ×10⁹/L, platelets × neutrophils ÷ lymphocytes retains ×10⁹/L. NLR, PLR, and LMR are unitless quotients.
Sources: [9]
Cell counts can change with illness, medicines, treatment, physiologic state, and collection time. Combining unrelated specimens or dates can create a result that represented neither assessment. This is a data-quality instruction; QuickMedCalc cannot verify specimen or timestamp provenance.
CBC values remain in ephemeral browser state. They are not added to the URL, saved in localStorage or sessionStorage, associated with an account, or submitted as a record to a QuickMedCalc backend. Reloading the page starts a clean record.
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Disclaimer
Educational and informational reference only. Not intended to replace professional medical advice, diagnosis, treatment, or independent verification.