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Anemia Dr.Sana Delawer Jalal Lecturer /Sulaimani College of Medicine/ Dept.of Pathology

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Anemia Dr.Sana Delawer Jalal Lecturer /Sulaimani College of Medicine/ Dept.of Pathology M.B.Ch.B, F.I.C.M.S. Red Cell Indices. Mean Cell Volume (MCV) It is calculated from PCV and red cell count as follows: MCV = PCV/RBC ( fl) Normal value: 80-95 fl

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Anemia

Dr.Sana Delawer Jalal

Lecturer /Sulaimani College of Medicine/ Dept.of Pathology

M.B.Ch.B, F.I.C.M.S.

red cell indices
Red Cell Indices

Mean Cell Volume (MCV)

  • It is calculated from PCV and red cell count as follows:
  • MCV = PCV/RBC ( fl)
  • Normal value:80-95 fl
  • It decrease in iron deficiency anaemia and haemoglopinopathies
  • It is increase in megaloblastic anaemia and chronic haemolytic anemia
mean cell haemoglobin concentration mchc
Mean Cell Haemoglobin Concentration (MCHC)
  • It is calculated from the haemoglobin and PCV as follows:
  • MCHC = Hb/PCV g/dl
  • Normal value: 32-35.5 g/dl
  • It is usually decreased in iron deficiency anaemia (microcytic hypochromic anaemia)
mean cell haemoglobin mch
Mean Cell Haemoglobin (MCH)
  • It is calculated from the haemoglobin and erythrocyte count as follows:
  • MCH = Hbx10/RBC pg
  • Normal value: 27-32 pg
  • It is decrease in iron deficiency anemia and thalassaemia (microcytic hypochromic anemia)
  • It is recognized by the pale colour of the red cell in the peripheral blood film
  • It is increase in macrocytic anemia (vitamin B 12 and folic acid)
red cell distribution width rdw
Red Cell Distribution width (RDW)
  • RDW reflects the variation of RBCs volume

it is usually performed by modern analysers

  • Normal RDW varies between 12 to 17
  • Severe iron deficiency anemia is associated with increased RDW
  • Thalassemia and anemia of chronic disease are associated with normal RDW
definition
Definition

Anemiais a decrease in the number of RBCs, Hb content, or Hematocrit below the lower limit of the normal range for the age and sex of the individual

  • In adults, the lower extreme of the normal haemoglobin is taken as 13.0 g/ dl for males and 11.5 g/dl for female
  • Newborn infants have higher haemoglobin level and, therefore, 15 g/dl is taken as the lower limit at birth
classification of anemia
Classification of Anemia
  • Several types of classifications of anemia\'s have been proposed
  • Two of the widely accepted classifications are based on :
  • The pathophysiology
  • The morphology
the pathophysiological classification
The Pathophysiological Classification

Depending upon the pathophysiologic mechanism, anemias are classified into 3 groups:

  • I. Anemia due to increased blood loss.
  • II. Anemias due to impaired red cell production.
  • III. Anemias due to increased red cell destruction .(Haemolytic )
the morphological classification
The Morphological Classification

Based on:

  • Red cell size,
  • Haemoglobin content
  • Red cell indices

Anaemias are classified into 3 types:

  • I. Microcytic, hypochromic
  • II. Normocytic, normochromic
  • III. Macrocytic, normochromic
simplified classification of anemias
Simplified Classification Of Anemias

1. Deficiency anemias

2. Aplastic anemia

3. Hemolytic anemias

4. Secondary anemias

impaired red cell production
Impaired Red Cell Production

A. Disturbance of proliferation and differentiation of stem cells( aplastic anemia, pure red cell aplasia)

B. Disturbance of proliferation and maturation of erythrocytes:

1.Defective DNA synthesis (megaloblastic anemias)

2.Defective Hb synthesis:

a/. Deficient heme synthesis (iron deficiency)

b/. .Deficient globin synthesis (thalassemia)

3. Unknown or multiple mechanisms (anemia of chronic disease, anemia of marrow replacement)

increased rate of destruction
Increased Rate Of Destruction

Intrinsic abnormalities

Hereditary

1. Red cell membrane defects (Hereditary spherocytosis, Hereditary eliptocytosis)

2. Red cell enzyme deficiencies

a/. Glycolytic enzymes: pyruvate kinase, hexokinase

b/. Enzymes of hexose monophosphate shunt:

G-6PD, glutathione synthetase.

3. Disorders of globin synthesis

a/. Deficient globin synthesis (thalassemia)

b/. Structurally abnormal globin synthesis

(sickle cell anemia, unstable hemoglobins)

Acquired

1. Membrane defect: paroxysmal nocturnal hemoglobinuria

increased destruction extri n sic abnormalities
Increased DestructionExtrinsic Abnormalities

1. Antibody Mediated

a/. Autoantibodies (idiopathic, drug-associated, SLE, malignancies)

b/. Alloantibodies (transfusion reactions, erythroblastosis fetalis)

2. Mechanical Trauma of RBCs

a/. Microangiopathic hemolytic anemias (thrombotic

thrombocytopenic purpura,hemolytic –uremic syndrome )

b/. Cardiac traumatic hemolytic anemia

3. Chemicals and Micro organisms

4. Sequestration in mononuclear phagocytic system

- hypersplenism

morphologic classification of anemias
Morphologic Classification Of Anemias

Type MCV MCHC Common cause

____________________________________________________

  • Macrocytic anemia increased normal Vitamin B12 deficiency

Folic acid deficiency

Microcytic anemia

- hypochromic decreased decreased Iron deficiency

Thalassemia

- normochromic decreased normal Spherocytosis

or normal

Normocytic anemia normal normal Aplastic anemia

- normochromic Chronic renal failure

Some hemolytic anemia

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Iron Deficiency

Anemia

Sideroblastic

Anemia

Thalassemia

Microcytic Anemia

MCV<80 fl

Anemia of Chronic

Disorder

Lead Poisoning

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Stem cells defects/

Reduced Erythropoiesis

Normocytic

Anemias

80-95 fl

Intrinsic

Extrinsic

Hemolytic Anemias

Intrinsic Defects

Extrinsic Causes

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Myelodysplastic

syndrome

Alcoholism

Megaloblasticanemia

Macrocytic Anemias

MCV> 95 fl

Hypothyrodisim

Liver Disease

Drugs

laboratory investigation
Laboratory Investigation
  • Anemia is not a diagnosis, but a sign of underlying disease
  • The objective of the laboratory is to :

determine the type of anemia as an aid in discovering the cause

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Laboratory Investigation-cont.

  • Screening is usually done with the CBC or "complete blood count"
  • Most laboratories now use automated, multiparameter instruments which will provide results for the following parameters:
  • Hemoglobin
  • Hematocrit
  • Red cell count
  • MCV , MCH ,MCHC
  • RDW
  • White cell and platelet count
  • Differentia WBC count.

l

laboratory investigation of hemolytic anemia
Laboratory Investigation of Hemolytic anemia
  • These are dividing into 4 groups:

I-Tests show increased red cell breakdown

II- Tests show increased red cell production

III- Tests show damage to red cells

IV- Tests show shortened red cell life span

tests show increased red cells breakdown
Tests Show Increased Red Cells Breakdown
  • Serum bilirubin-unconjugated (indirect)bilirubin is raised
  • Urine Urobilinogen is raised
  • Faecal Stercobilinogen is raised
  • Serum haptoglobin ( α globulin binding protein) is reduced or absent
  • Plasma lactic acid dehydrogenase is raised
  • Evidence of intravascular haemolysis in the form of haemoglobinaemia, haemoglobinuria, haemosiderinuria
tests show increased red cells production
Tests Show Increased Red Cells Production.
  • Reticulocyte count reveals reticulocytosis which indicate marrow erythroid hyperplasia
  • Routine blood film shows macrocytosis, polychromasia, and normoblasts
  • Bone marrow show erythroid hyperplasia
  • X ray of bones shows evidence of expansion of marrow spaces especially in tubular bones and skull
tests revealing damages to rbcs
Tests Revealing Damages To RBCs
  • Routine blood film shows a variety of abnormal morphological appearances of red cells
  • Osmotic fragility is increased
  • Autohaemolysis test
  • Coomb\'s antiglobulin test
  • Electrophoresis for abnormal haemoglobin
  • Estimation of HbA2
tests show shortened red cell life span
Tests Show Shortened Red Cell Life Span
  • Tested by Cr51 labeling method normal RBC life span of 120 days is shortened to 20-40 days in moderate haemolysis and 5-20 days in severe haemolysis
special investigations
Special Investigations
  • Biochemical Tests

biochemical tests are aimed to identifying:

1-Depleted cofactors necessary for normal hematopoiesis (iron, ferritin, folate, B12).

2-Abnormally functioning enzyme (glucose-6-phosphate dehydrogenase, pyruvate kinase), or

3-Abnormal function of the immune system (the direct antiglobulin [Coombs\'] test).

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