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Peripheral Blood Smears
Department of Internal Medicine
Divisions of Hematology and Laboratory Medicine
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Complete Blood Count
Automated cell counting
Peripheral blood morphology
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Automated Cell Counting: Deficiencies
Abnormalities and inclusions in WBC
RBC shape abnormalities
RBC inclusions
Platelet abnormalities and clumping
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Peripheral Blood Morphology
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Peripheral SmearsBarnes-Jewish Hospital
Daily total
Total CBCs 900-1100Peripheral smears*
Laboratory initiated 100-200Physician-initiated ~20
* Smears are saved for 30 days
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Normal Peripheral Smear
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Normal Peripheral Smear
“More information can be gained fromexamining the blood smear than
from any single hematologic procedure”
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Clinical Indications for Examination of a Blood Smear Anemia, unexplained jaundice or both Features of thrombocytopenia or neutropenia Features suggestive of possible lymphoproliferative disorder Feature suggestive of a myeloproliferative disorder Suspicion of DIC Acute or recent onset renal failure Suspicion of a bacterial or parasitic disease that can be diagnosed
on a smear Features of a non-hematopoietic cancer (weight loss, bone pain) General ill health (malaise, fever)
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Reticulocyte: Polychromasia
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Reticulocyte Manual Count by Supravital Stain: Normal Count
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Reticulocytes: Elevated Count
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Erythrocyte Inclusions with Wright’s Stain
Inclusion Composition Appearance Condition
Basophilic Precipitated Evenly dispersed Lead poisoningstippling ribosomes fine or coarse granules thalassemia
other anemias
Howell-Jolly Nuclear Dense, round Post-splenectomybodies fragment blue granule
Pappenheimer Iron-containing Small blue granules Anemiasbodies granules in clusters
Organism Small blue inclusion MalariaBabesiosis
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Basophilic Stippling
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Howell-Jolly Body
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Malaria
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RBC Inclusions: Composite
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Erythrocyte Distribution Abnormalities
Rouleaux formation Stacking of RBCs due to increased plasma proteins coating RBCs
Agglutination Antibody-mediated clumping;
temperature dependent
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Rouleaux Formation
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Agglutination Reaction
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Variations in RBC Size and Shape
Anisocytosis Variations in size (e.g. microcytes)
Poikilocytosis Variations in shape (e.g. target cells)
Hypochromia Increased central pallor due to decrease in hemoglobin
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Hypochromic Microcytic RBC
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Normal Hypochromic microcytic
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Hypochromia without Anisocytosis: Thalassemia Trait
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Severe Hypochromia: Iron Deficiency Anemia
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Mixed Population: Treated Iron Deficiency Anemia
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Microcytic Hypochromia: Alpha Thalassemia (-/--)
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Microcytic Hypochromia: Beta Thalassemia Major
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Microcytic Hypochromia: Beta Thalassemia Major
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Macrocytic Anemia: Macro-Ovalocytes
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Shape Abnormalities of Erythrocytes
Terminology Description Condition
Target cells Central hemoglobin; target-shaped Liver disease; thalassemia: Abnormal Hgb; iron deficiency
Echinocyte Short spicules, equally-spaced Uremia, hypokalemia, artifact
Acanthocyte Spiculated, irregular Liver disease (alcohol),Post-splenectomy
Spherocyte Spherical, no central pallor HS, Immune hemolytic anemia
Schistocyte Fragmented RBC, helmet cells MAHA, burns
Ovalocyte Oval/elliptical shaped Hereditary elliptocytosis,Megaloblastic anemia
Sickle cell bipolar spiculated shape Hgb S-containing “banana” shaped hemoglobinopathy
Teardrop cell single elongated extremity Myelophthistic changes
Bite cells Irregular gap in membrane G6PD deficiency
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Target Cells Diagnostic possibilities
• Liver disease
• Hemoglobinopathy
• Thalassemia
• Iron deficiency
• Post-splenectomy
• Lipid disorders
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Echinocytes (Burr Cells)
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Acanthocytes (Spur Cells)
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Target Cells Spur Cells
Morphologic Changes in Liver Disease
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Hepatorenal Syndrome: Burr + Spur Cells
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Spherocytes
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Spherocytes: Autoimmune Hemolytic Anemia
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Spherocytes: Hereditary Spherocytosis
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Schistocytes: Microangiopathic Hemolytic Anemia
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Elliptocytes: Hereditary Elliptocytosis
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Sickle Cell Anemia: Hgb SS
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Hemoglobin SC Disease
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Hemoglobin S-Beta Thalassemia
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Homozygous Hemoglobin C Disease (Hgb CC)
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Teardrop Cells
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Bite Cells
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Heinz Bodies
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Morphology of Leukocytes
Normal WBC populations• Neutrophils (Granulocytes)
• Lymphocytes
• Monocytes
• Eosinophils
• Basophils
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Neutrophil
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Eosinophil
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Neutrophil Eosinophil
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Monocytes
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Monocytes
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Small Lymphocyte
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Small
Intermediate
Large
Lymphocytes
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Basophils
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Granulocyte Inclusions or VariantsTerminology Description Condition
Dohle bodies Pale blue areas in Infections, pregnancy, cancer neutrophil cytoplasm
Toxic Large purple granules InfectionGranulation in neutrophil cytoplasm
Vacuoles Transparent areas Infection, Toxin in neutrophil cytoplasm
Hypersegmented ≥ 6 nuclear lobes Megaloblastic anemia
Auer rods Reddish long needle-like Acute myeloid leukemia inclusions
Ehrlichia Blue inclusions in Ehrlichia sp. monocytes/neutrophils
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Dohle Bodies
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Toxic Granulation
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Toxic Granulation and Vacuole Formation
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Hypersegmented Neutrophils
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Auer Rod: Acute Myeloid Leukemia
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Ehrlichia
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Myeloid Leukemias and Leukemoid Reaction Bone marrow exam is almost always indicated
• Cytogenetic analysis
• Flow cytometry analysis
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Neutrophilia: Leukemoid Reaction
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Neutrophilia: CML
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Pelger-Huet Abnormality
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Acute Myeloid Leukemia: M1Myeloblasts without Differentiation
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Acute Myeloid Leukemia: M2Myeloblasts with Some Differentiation
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Acute Myeloid Leukemia: M3 Promyelocytic Leukemia
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Acute Myeloid Leukemia: M4 Myelomonocytic Leukemia
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Acute Myeloid Leukemia: M5 Monocytic Leukemia
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Acute Myeloid Leukemia: M6Erythroleukemia
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Acute Myeloid Leukemia: M7Megakaryocytic Leukemia
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Abnormalities of Lymphocytes
Variant Morphologic categories
Atypical lymphs Abundant cytoplasm, RBC “skirting”
Abnormal lymphs Nuclear abnormalities i.e. clefts, folds, notches
Plasmacytoid lymphs Abundant cytoplasm
Hairy cells Cytoplasmic projections
Sezary cells Deeply folded nucleus
Prolymphocyte Large lymph with prominent nucleolus
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Atypical (Reactive) Lymphocytes
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Atypical (Reactive) Lymphocytes
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Abnormal Lymphocytes
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Plasmacytoid Lymphocytes
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Plasma Cell: Plasma Cell Leukemia
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Hairy Cell: Hairy Cell Leukemia
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Sezary Cell
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Prolymphocytes
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Chronic Lymphocytic Leukemia (CLL)
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CLL: Smudge Cells
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CLL: Balloon Cells
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Acute Lymphocytic Leukemia: L1
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Acute Lymphocytic Leukemia: L2
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Acute Lymphocytic Leukemia: L3 (Burkitts)
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Blood smears - The future
Long-term storage - digital imaging of abnormal smears
Increased education (Featured in journals) Image-recognition technology Tele-hematology for remote interpretation or
second opinions
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Spend time with your family and friendsSpend time with your family and friends
Enjoy activities outside of the hospitalEnjoy activities outside of the hospital
Exercise or participate in sportsExercise or participate in sports