6. diagnosing anemia - capital health nova scotia · anemia • decrease in the number of...
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Diagnosing AnemiaDiagnosing Anemia
Dr Robert Liwski MD PhD FRCPCDr. Robert Liwski, MD, PhD, FRCPCMedical Director, HLA Typing LaboratoryDivision of HematopathologyDepartment of Pathology and Laboratory Medicinep f gy yDalhousie [email protected]
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AnemiaAnemia• Decrease in the number of circulating redg
blood cells, resulting in decreased oxygen carrying capacity
• Most common hematologic disorder
• Most cases due to a secondary disorder
• Critical for physicians to know how to determine the causethe cause
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Red cell functionRed cell function
• Function:Function:– Oxygen delivery to tissues
Removal of CO from tissues– Removal of CO2 from tissues– Mediated by hemoglobin within the red
cellscells.
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Hemoglobin structureHemoglobin structure
Hemoglobin cannot be made without iron !
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Normal red cell morphologyNormal red cell morphology
Central pallorNormally less than ½ diameter
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Cellular blood components• Red cells • Platelets • White cells
N t hil– Neutrophils– Monocytes– LymphocytesLymphocytes– Eosinophils– Basophils
• All formed in the bone marrow through a process called hematopoiesisprocess called hematopoiesis
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Erythropoiesis
Kidney
Bone MarrowBone Marrow
http://yewbiotech.com/blog/erythropoiesis/
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Bone marrow examination
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Bone marrow aspirate smear preparation
Drop of marrow
Slide 1Slide 2
Slide 2
On contact, slide 2 extends the drop along its 1” side
Slide 2
Pushing angled slide 2 g galong #1 smears the line of blood across slide 1
Smear
Lift away slide 2; dry #1 ; stain; coverslip
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2. Basophilic erythroblastErythropoiesis
1. Proerythroblast3. Polychromatic erythroblasts
4. Orthochromatic erythroblastserythroblasts
Aspirate 100x
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Erythropoiesis
5. Nuclear expulsion
4 O th h ti4. Orthochromatic erythroblasts
Aspirate 100x
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PB 50x
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Causes of anemiaCauses of anemia
• Blood lossBlood loss
D d d ti f d bl d ll• Decreased production of red blood cells– Nutritional deficiencies– toxic exposures– Renal failure (↓erythropoietin)– bone marrow failure/disorders
• Increased destruction (hemolysis)
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Shotgun approachShotgun approach• Iron studies (Ferritin, Fe, TIBC, % sat, zinc protoporhyrin)• B12, folate, MMAB12, folate, MMA• Thyroid hormones• Hemolysis screen (LD, bili, haptoglobin, urine Hgb and
hemosiderin)hemosiderin)• Coombs/DAT test• Enzymopathy screen (G6PD, pyruvate kinase)
H l bi l t h i• Hemoglobin electrophoresis• Osmotic fragility• PNH testing• Endoscopy• Bone marrow examination• HepcidinHepcidin• Soluble transferrin receptor • HLA typing (DR15)
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Targeted approachTargeted approach• History (acute vs chronic, kinetics, ethnic
backgro nd) and E ambackground) and Exam
• Complete Blood Count (CBC)Complete Blood Count (CBC)– HGB, RBC, MCV, RDW, WBC diff, PLT
• peripheral blood smear– morphology
• Absolute reticulocyte count
• Serial test selection
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Case 1Case 1• 25-year-old female, G1P0 (12 weeks gestation), y ( g )
originally from China
• Asymptomatic exam unremarkable• Asymptomatic, exam unremarkable
• History of heavy menstruationHistory of heavy menstruation
• CBC: WBC 9.8 (N), Hgb 107 (L), Plt 180 (N)
• What else do you want to know?
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Case 1F ll CBC P i h l bl d• Full CBC– WBC 9.8 (N)
RBC 6 35 (H)
• Peripheral blood smear
Microcytosis– RBC 6.35 (H)– HGB 107 (L)– MCV 68 (L)
– Microcytosis– Hypochromia– Target cellsMCV 68 (L)
– MCHC 240 (L)– RDW 14.7 (N)
Target cells– Elliptocytes
( )– PLT 180 (N)
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Case 1F ll CBC P i h l bl d• Full CBC– WBC 9.8 (N)
RBC 6 35 (H)
• Peripheral blood smear
Microcytosis– RBC 6.35 (H)– HGB 107 (L)– MCV 68 (L)
– Microcytosis– Hypochromia– Target cellsMCV 68 (L)
– MCHC 240 (L)– RDW 14.7 (N)
Target cells– Elliptocytes
( )– PLT 180 (N)
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Case 1F ll CBC P i h l bl d• Full CBC– WBC 9.8 (N)
RBC 6 35 (H)
• Peripheral blood smear
Microcytosis– RBC 6.35 (H)– HGB 107 (L)– MCV 68 (L)
– Microcytosis– Hypochromia– Target cellsMCV 68 (L)
– MCHC 240 (L)– RDW 14.7 (N)
Target cells– Elliptocytes
( )– PLT 180 (N)
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Microcytic anemia (MCV < 80)Microcytic anemia (MCV < 80)
• Differential diagnosis:Differential diagnosis:– Iron deficiency
Anemia of chronic inflammation– Anemia of chronic inflammation– Thalassemia
Lead poisoning– Lead poisoning – Sideroblastic anemia
Rare
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Hemoglobin structureHemoglobin structure
Hemoglobin cannot be made without iron !
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Iron deficiency vs thalassemiaRBC Hgb MCV RDW
Iron deficiency vs thalassemia
Thalassemia N or high 100 120 <70 NThalassemia N or high 100-120 <70 N
Iron deficiency
Low or N <100 <80Proportionate
High
to Hgb
Confirm with hemoglobin electrophoresis and serum iron studies
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Serum Iron StudiesIron deficiency vs ACI
Serum Iron Ferritin TIBC % Iron Saturation
ACI Low or N High Low Low
I L N Low Hi h LIron deficiency
Low or N Low High Low
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Case 1Case 1
• Full CBC • Peripheral bloodFull CBC– WBC 9.8 (N)– RBC 6.35 (H)
Peripheral blood smear– Microcytosis( )
– HGB 107 (L)– MCV 68 (L)
– Hypochromia– Target cells
– MCHC 240 (L)– RDW 14.7 (N)
PLT 180 (N)
– Elliptocytes
– PLT 180 (N)
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Case 1Case 1
• Full CBC • Peripheral bloodFull CBC– WBC 9.8 (N)– RBC 6.35 (H)
Peripheral blood smear– Microcytosis( )
– HGB 107 (L)– MCV 68 (L)
– Hypochromia– Target cells
– MCHC 240 (L)– RDW 14.7 (N)
PLT 180 (N)
– Elliptocytes
– PLT 180 (N)
Ferritin 50 (N)Hgb electro shows increased Hgb A2
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DiagnosisDiagnosis
• Beta Thalassemia TraitBeta Thalassemia Trait
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Case 2Case 2
• 40-year-old female diagnosed with lupus40 year old female, diagnosed with lupus 1 year ago
• Presents with week of progressive fatigue d SOB 3 d f “ ll ki ”and SOB, 3 days of “yellow skin”.
• On exam: BP=110/70, HR=110/min, pallor, jaundice, swollen MCP jointsp , j , j
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Case 2Case 2
• Full CBC • Peripheral bloodFull CBC– WBC 4.8 (N)– RBC 2.1 (L)
Peripheral blood smear– Spherocytes( )
– HGB 70 (L)– MCV 96 (N)
– Marked polychromasia
– MCHC 355 (N)– RDW 16.1 (H)
PLT 140 (L)– PLT 140 (L)
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Normocytic anemia (MCV 80-100)Normocytic anemia (MCV 80 100)
• Low/N reticulocyte count: • High reticulocyte county– Anemia of chronic
inflammation
g y– Acute blood loss– Hemolysis
– Early iron deficiency– Renal failure
Endocrinopathies
• Congenital (enzymopathies, membrane defects,
– Endocrinopathies– Bone marrow disorder
(MDS, marrow failure,
hemoglobinopathy)• Acquired (Immune vs
Non-immune)( , ,leukemia, lymphoma, infiltration)
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Case 2Case 2
• Full CBC • Peripheral bloodFull CBC– WBC 4.8 (N)– RBC 2.1 (L)
Peripheral blood smear– Spherocytosis( )
– HGB 70 (L)– MCV 96 (N)
– Marked polychromasia
– MCHC 355 (N)– RDW 16.1 (H)
PLT 140 (L)– PLT 140 (L)
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Case 2Case 2
• Full CBC • Peripheral bloodFull CBC– WBC 4.8 (N)– RBC 2.1 (L)
Peripheral blood smear– Spherocytosis( )
– HGB 70 (L)– MCV 96 (N)
– Marked polychromasia
– MCHC 355 (N)– RDW 16.1 (H)
PLT 140 (L)– PLT 140 (L)
What would you order now?
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Case 2Case 2
• Reticulocyte countReticulocyte count
• Hemolysis screen (LDH indirect bili• Hemolysis screen (LDH, indirect bili, haptoglobin)
• DAT
• Type and screen***
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Case 2Case 2• Reticulocyte count 450 y
• LDH 710
• Indirect bili 80
• Haptoglobin 0
• DAT: IgG 3+, C3b 2+
• Type and screen: A+ screen pan-reactiveType and screen: A+, screen pan reactive
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DiagnosisDiagnosis
• Autoimmune hemolytic anemiaAutoimmune hemolytic anemia
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Case 3Case 3
• 70-year-old female history of gastritis70 year old female, history of gastritis
6 k f f ti 3 k i 1• 6 weeks of fatigue, 3 weeks angina, 1 week shortness of breath
• On exam: BP=140/90, HR=110/min, , ,pallor, ataxia, weakness
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Case 3Case 3
• Full CBC • Peripheral bloodFull CBC– WBC 2.0 (L)– RBC 1.5 (L)
Peripheral blood smear– Macrocytosis( )
– HGB 55 (L)– MCV 124 (H)
– Hypersegmented neutrophils
– MCHC 355 (N)– RDW 17.1 (H)
PLT 140 (L)– PLT 140 (L)
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Macrocytic anemia (MCV > 100)Macrocytic anemia (MCV > 100)
• Differential diagnosis:Differential diagnosis:– Megaloblastic anemia:
• Vitamin B12/folate deficiency• Anti-metabolite chemotherapeutic drugs
– Increased reticulocyte countDrug induced (anti retroviral therapy)– Drug induced (anti-retroviral therapy)
– Alcohol abuse– Liver diseaseLiver disease– Hypothyroidism– Myelodysplastic syndrome– Aplastic anemia
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Case 3Case 3
• Full CBC • Peripheral bloodFull CBC– WBC 2.0 (L)– RBC 1.5 (L)
Peripheral blood smear– Macrocytosis( )
– HGB 55 (L)– MCV 124 (H)
– Tear drop cells– Hypersegmented
t hil– MCHC 355 (N)– RDW 17.1 (H)
PLT 140 (L)
neutrophils
– PLT 140 (L)
What would you order next?What would you order next?
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Case 3Case 3
• Reticulocyte count 25 (L)Reticulocyte count 25 (L)
Vit i B12 100 /L (L )• Vitamin B12 100 ng/L (Low)• Folate normal
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DiagnosisDiagnosis
• Vitamin B12 deficiencyVitamin B12 deficiency
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Questions?
Thank you