Pathcalc for Pathologists
Pathology & lab medicine calculators
Hematology calculators, histopathological grading and scoring and diagnostic algorithms for Pathologists and Pathology PG students.
Hematology Calculators
CBC, CSF, and semen analysis calculations — screening indices, chamber-count conversions, and correction formulas.
- AEC, ANC & I/T Ratio Three independent modules: absolute eosinophil count, absolute neutrophil count, and I/T ratio.
- Corrected Reticulocyte Count Adjusts reticulocyte % for degree of anemia, with an optional Reticulocyte Production Index.
- Corrected WBC for NRBCs Corrects an automated WBC count for nucleated RBC interference, with a manual-count mode.
- CSF Neubauer Chamber Calculator WBC, RBC, differential count, traumatic tap correction, and blast % — six independent modules.
- Mentzer Index Calculator Screens iron deficiency anemia vs. thalassemia trait from MCV and RBC count, with worked examples.
- Sperm Count Calculator Neubauer chamber sperm concentration and total count per ejaculate, with duplicate-count mode.
Histological Grading & Scoring
CAP-protocol-based tumor grading and risk scoring — breast, GI/neuroendocrine, endocrine, and liver pathology.
- Adrenal Cortical Neoplasm Scoring Weiss, Modified Weiss, Reticulin, Lin-Weiss-Bisceglia, Helsinki, and Wieneke — six independent algorithms.
- Appendiceal Carcinoma Grading Separate nonmucinous and mucinous grading, with independent appendiceal and peritoneal assessment.
- Appendiceal NET Grading WHO/ENETS G1–G3 grading with higher-grade-prevails logic and a live decision matrix.
- Breast Biomarker Reporting Independent ER, PgR, and HER2 modules (with ISH reflex) plus a combined final report.
- Colorectal NET Grading Mitotic rate + Ki-67 WHO grading for colorectal neuroendocrine tumors.
- Cutaneous SCC Grading Qualitative 4-tier feature-checklist grading plus the Broders % quantitative system, with a combined 2-tier risk summary.
- DCIS Size / Extent Calculator Four distinct CAP estimation methods; automatically reports the largest applicable estimate.
- Duodenal & Ampullary NET Grading Site-specific WHO grading for duodenal and ampullary neuroendocrine tumors.
- Gastric HER2 Biomarker Reporting ToGA/Hofmann IHC scoring criteria for gastric/GEJ adenocarcinoma, with reflex-ISH guidance.
- Gastric NET Grading Site-specific WHO grading for gastric neuroendocrine tumors.
- GIST Grading & Risk Assessment Mitotic-rate-only histologic grade plus the full Miettinen & Lasota site-specific risk table.
- Gynecologic Biomarker Reporting ER, PgR, HER2 (dual-pathway), MMR, p53, PD-L1, and FOLR1 — seven independent modules plus a combined final report.
- HCC Histologic Grading AJCC 8th edition 4-tier hepatocellular carcinoma grade, with support for documenting alternative systems.
- Jejunal & Ileal NET Grading Site-specific WHO grading for small intestinal neuroendocrine tumors.
- Lung Tumor Grading & Histologic Classification Invasion assessment, AIS/MIA/lepidic-predominant classification, IASLC grade, neuroendocrine tumor grade, and AJCC 4-tier grading.
- Melanoma Grading Breslow thickness, AJCC T-category, Clark level, and mitotic rate calculator.
- Mitotic Rate per 2 mm² Converts a raw HPF mitotic count into mitoses/2 mm² using your microscope's actual field diameter.
- Nottingham Grading Calculator Modified Bloom–Richardson histologic grade for invasive breast carcinoma, color-coded by grade.
- Ovarian Tumor Grading Endometrioid, mucinous, immature teratoma, and Sertoli-Leydig cell tumor grading modules in one app.
- Pancreatic NET (PanNET) Grading WHO grading for pancreatic neuroendocrine tumors, with a necrosis-correlation note.
- Penile SCC Grading Feature-based G1–G3 grading, with any anaplastic feature sufficient for Grade 3 regardless of lower-grade findings.
- Phyllodes Tumor Classification CAP-based benign / borderline / malignant classification with full reasoning shown.
- PPGL & PitNET Proliferative Index Precise mitotic rate and Ki-67 reporting for dynamic risk stratification — no formal WHO grade exists.
- Prostate Gleason Grading Pattern-based Gleason score and Grade Group, with pattern-4 % bucketing, cribriform flag, and an HPF-based extent calculator.
- RCC WHO/ISUP Grading Feature-checklist WHO/ISUP nucleolar grading (G1–G4) for renal cell carcinoma, with full reasoning shown.
- Salivary Gland Carcinoma Grading Category/subtype risk stratification across 20+ carcinoma types, plus a separate WHO neuroendocrine tumor grade module.
- Thyroid MTC Grading IMTCGS two-tier high/low-grade medullary thyroid carcinoma calculator, with a decision tree.
- Uterine Sarcoma Classification Entity-based diagnostic criteria for adenosarcoma, leiomyosarcoma, endometrial stromal sarcoma, and undifferentiated sarcoma.
Diagnostic Algorithms
Tools that route to a diagnosis or next step — flowcharts and exclusion-based classification — rather than a single grade.