CBC / Differential Calculator & Workspace
Enter one CBC/differential record to calculate supported ANC, AMC, AEC, NLR, PLR, LMR, and SII outputs with explicit reported-versus-calculated provenance.
Content updated: View sources
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Formula and medical content are based on the references listed on this page. See sources, About, and Sources and Review Process.
About
This workspace accepts one CBC/differential record and calculates every supported absolute count and CBC-derived ratio that the supplied record can actually support. Each output identifies whether its absolute-count source was reported or calculated; missing values are never filled with zero or a presumed normal value. [1, 3]
ANC, AMC, and AEC calculations use the existing validated exact-arithmetic engines. PLR, LMR, and SII use their existing ratio engines after the resolver has established absolute-count provenance from this same record. NLR uses its existing engine with either matched established absolute counts or matched reported neutrophil and lymphocyte percentages from the same differential. [5, 6, 8]
CBC-derived ratios are research and descriptive indices whose distributions and study cutoffs vary by population, disease, sampling time, medicines, and analytical purpose. The workspace does not apply a universal category, diagnose disease, estimate an individual prognosis, or recommend treatment. [4, 7]
Formula
Interpretation
What the workspace returns
Available absolute counts retain their source identity. PLR, LMR, and SII appear only when their required absolute counts are available from the same record. NLR can instead use a matched reported neutrophil and lymphocyte percentage pair directly. Every unsupported output is shown as “Not available from this record,” with the missing dependency stated.
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, 4]
No dynamic disease bands
Published ANC, eosinophilia, NLR, PLR, LMR, and SII thresholds belong to specific laboratory, disease, and study frameworks. This workspace preserves the arithmetic and provenance without applying those frameworks automatically. [7, 9, 10]
Separate CBC calculations remain separate products
Mentzer Index remains a red-cell MCV/RBC task. Reticulocyte Production Index remains a reticulocyte/hematocrit/maturation task. Transferrin saturation remains an iron/TIBC task. This workspace consolidates only repeated CBC differential and count-derived arithmetic.
Ephemeral record handling
The form runs locally in the browser. It does not add values to the URL, save a record in browser storage, create an account, or send a CBC record to a QuickMedCalc backend.
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.
- 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
It returns only the ANC, AMC, AEC, NLR, PLR, LMR, and SII outputs supported by values entered from one same-time-point CBC/differential record. Missing dependencies remain explicitly unavailable.
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 requires 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 count may be reported or safely derived from this same record.
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: [7]
No. After the existing runtime normalizes counts to ×10⁹/L, platelets × neutrophils ÷ lymphocytes retains ×10⁹/L. NLR, PLR, and LMR are unitless quotients.
Sources: [8]
Cell counts can change with illness, medicines, treatment, physiologic state, and collection time. Combining unrelated reports can create a ratio that represented neither assessment.
No. Mentzer Index is a red-cell MCV/RBC task, RPI uses reticulocyte and hematocrit inputs with a maturation model, and transferrin saturation uses iron and TIBC. They remain separate calculators.
Related Calculators
Mentzer Index
Calculate the historical Mentzer Index from same-CBC MCV and RBC count as a non-diagnostic screening aid for microcytosis.
RPI
Calculate the historical adult Hillman RPI from a relative reticulocyte percentage and paired hematocrit using the fixed 45% standard and source-specific maturation bands.
TSAT
Calculate TSAT from same-assessment serum iron and laboratory-reported TIBC with exact unit normalization.
Disclaimer
Educational and informational reference only. Not intended to replace professional medical advice, diagnosis, treatment, or independent verification.