Haematology — White Cell & Inflammatory Ratios
Every haematology — white cell & inflammatory ratios calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
24 calculators in this section
- Absolute Basophil Count CalculatorTurn a white cell count and a basophil percentage into the absolute basophil count — and read a persistent basophilia for what it is, a recognised feature of chronic myeloid leukaemia.
- Absolute Eosinophil Count (AEC) CalculatorTurn a white cell count and an eosinophil percentage into the absolute eosinophil count, and read it against the thresholds that actually define eosinophilia and hypereosinophilia.
- Absolute Lymphocyte Count (ALC) CalculatorTurn a white cell count and a lymphocyte percentage into the absolute lymphocyte count, and read a low result properly — most lymphopenia is transient, and the count that stays down is the one that needs a cause.
- Absolute Monocyte Count (AMC) CalculatorTurn a white cell count and a monocyte percentage into the absolute monocyte count — and see why 0.5 ×10⁹/L now matters even though it sits inside the reference interval.
- Absolute Neutrophil Count (ANC) CalculatorConvert a white cell count and differential into the absolute neutrophil count, and read the neutropenia bands correctly.
- Blast Percentage InterpreterThere is no longer one answer to this. The WHO 5th edition and the International Consensus Classification, both published in 2022 and both in use, set different blast thresholds for the same diseases — and both define entities in which a genetic abnormality makes the percentage irrelevant. This page prints what each classification says about your case rather than picking a side, because a report that names one system and a reader who assumes the other is how a diagnosis gets misread.
- CD4 Count and Percentage CalculatorTurn a white cell count, a lymphocyte percentage and a CD4 percentage into an absolute CD4 count — with the ×10⁹/L to cells/µL step done properly, and the percentage that survives when the absolute count cannot be trusted.
- Chemotherapy Dose Delay InterpreterThere is no universal neutrophil or platelet threshold for giving chemotherapy, and a page that printed one as though there were would be worse than no page. The thresholds are written into each regimen's own protocol, they differ between regimens and between trials, and the commonly used figures are convention rather than evidence. What this page does is state the convention honestly, show where it comes from, and set out the decisions that sit around it — including the one about dose intensity that matters more than the threshold does.
- Corrected White Cell Count for Nucleated Red CellsAutomated analysers count nucleated red cells as white cells, so a marrow-stressed sample reports a falsely high WBC. Correct it here — and correct it before any absolute neutrophil count is derived.
- Eosinophilia Severity InterpreterClassify an absolute eosinophil count as mild, moderate or severe — and separate hypereosinophilia from hypereosinophilic syndrome, which the count alone can never do. A moderate count with a raised troponin outranks a severe one from a drug rash.
- Febrile Neutropenia Risk: MASCC and CISNEThe decision at the bedside is not whether this is febrile neutropenia — it is whether this patient is low-risk enough for oral antibiotics or discharge. Two published instruments answer it and they were derived in different populations, so they disagree in a way that is informative rather than annoying. This page computes both from one set of entries and shows them together, with the population each was built on stated. Neither score overrides clinical judgement, and neither was designed to.
- Immature to Total Neutrophil Ratio (I:T) CalculatorCalculate the I:T ratio from a neonatal differential — and read it for what it does, which is rule sepsis out rather than rule it in. A ratio below 0.2 has never been a reason to stop antibiotics in a baby who looks septic.
- Leukocytosis Differential InterpreterA raised white cell count is not a diagnosis. The height of the count narrows the field a little, but it is the differential, the film and — when they point that way — the flow cytometry and the molecular test that decide between a reaction, a leukaemoid reaction and a leukaemia. This page works through the six features that actually discriminate and tells you which test settles it. It will not tell you the count is benign, because no count can.
- Lymphocyte-Monocyte Ratio (LMR) CalculatorCalculate the lymphocyte-monocyte ratio — and read the honest caveat with it. There is no reference interval and no agreed cut-off; every published threshold was chosen from a single study's own data.
- Lymphocytosis InterpreterTwo numbers decide most of this and they are constantly confused with each other. One is the lymphocyte count that makes a result lymphocytosis at all. The other is the clonal B-cell count of 5 × 10⁹/L that separates monoclonal B-cell lymphocytosis from chronic lymphocytic leukaemia — and it counts the clone, not the lymphocytes. This page keeps them apart, and is clear that monoclonal B-cell lymphocytosis is a diagnosis with a real annual rate of progression, not a way of saying nothing is wrong.
- Monocyte to HDL Cholesterol Ratio (MHR) CalculatorThe monocyte count divided by HDL cholesterol — and the only thing that matters about it. The same patient scores 0.45 or 11.69 depending on which units the two numbers are in, so a cut-off quoted without its units means nothing.
- Neutropenia Severity Grading InterpreterGrade neutropenia by absolute neutrophil count. First, the thing that matters more than the grade: a temperature of 38.3 °C once, or 38.0 °C for over an hour, with a neutrophil count below 0.5 ×10⁹/L is a medical emergency needing antibiotics within one hour.
- Neutrophil-Lymphocyte Ratio (NLR) CalculatorCalculate the neutrophil-lymphocyte ratio and read it as what it is — a broad stress marker, not a specific diagnostic test.
- Pan-Immune-Inflammation Value (PIV) CalculatorCalculate PIV from all four cell lines — and know which units you are in before you compare the answer with anything. The published convention and the per-microlitre one differ by a factor of a million.
- Pancytopenia InterpreterMarrow infiltration, megaloblastic anaemia, hypersplenism and aplasia can produce identical numbers. The counts tell you how urgent this is and nothing at all about why it is happening. Two things do: the reticulocyte response, which splits production failure from destruction and sequestration, and the blood film, which is the cheapest and most informative test in the whole work-up. This page grades each cytopenia by a named scale and then asks the two questions that actually narrow the differential.
- Platelet-Lymphocyte Ratio (PLR) CalculatorCalculate the platelet-lymphocyte ratio, another broad inflammatory marker with the same caveats as NLR.
- Systemic Immune-Inflammation Index (SII) CalculatorCalculate SII from platelets, neutrophils and lymphocytes — and see why no single cut-off applies across conditions.
- Systemic Inflammation Response Index (SIRI) CalculatorCalculate SIRI — the neutrophil-lymphocyte ratio with the monocyte brought in. Seven studies of the same cancer put the cut-off anywhere between 0.69 and 2.35, which tells you what a cut-off is worth here.
- White Blood Cell Count ConverterConvert a white cell count between ×10⁹/L, ×10³/µL, K/µL, cells/µL and cells/mm³ — and see why a normal total is not the reassurance it looks like.