From the CBC to the diagnosis. Every RBC disease, connected by the finding that separates it.
Rev 3Updated 2026-10-09
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Master Map — All RBC Diseases
Start at MCV → follow the branch → detailed trees on the next pages
31 diagnoses · 6 decision points
100%
Microcytic Anemias
Branch point: iron studies → then source, marrow, or electrophoresis
15 diagnoses · 4 decision points
100%
Normocytic Anemias — Underproduction
Branch point: reticulocyte index → which cell lines are low → marrow
9 diagnoses · 3 decision points
100%
Hemolytic Anemias — Immune (Coombs +)
Branch point: DAT → antibody type & clinical context
9 diagnoses · 5 decision points
100%
Hemolytic Anemias — Non-immune (Coombs −)
Branch point: smear morphology → confirmatory test
14 diagnoses · 5 decision points
100%
Macrocytic Anemias & Polycythemia
Branch point: hypersegmented PMNs → MMA/homocysteine → cause
14 diagnoses · 6 decision points
100%
Start− / +5 open / closed branchDecision / testCategoryDx = final diagnosis (click for facts)Jump to another tabfinding= what sends you down that branchStep 1 noteIn-house pearlEXAM HEM07 in-house lectureSTEP 1 USMLE high-yield
Click a round button to open or close a branch (the number = diagnoses inside). Click any Dx card to open its high-yield facts, look-alikes and images (↑ ↓ step through diagnoses, Esc closes). Drag the background to pan · ← → switch tabs.