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Macrocytic and Megaloblastic Anemia

The document discusses macrocytic anemias which result from deficiencies in folate or vitamin B12. These deficiencies impact DNA synthesis and neurological functions. Common symptoms include anemia, jaundice, and glossitis. Neurological features occur in vitamin B12 deficiency. Laboratory tests show macrocytic anemia, abnormalities in blood smears, and megaloblasts in bone marrow.

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24 views5 pages

Macrocytic and Megaloblastic Anemia

The document discusses macrocytic anemias which result from deficiencies in folate or vitamin B12. These deficiencies impact DNA synthesis and neurological functions. Common symptoms include anemia, jaundice, and glossitis. Neurological features occur in vitamin B12 deficiency. Laboratory tests show macrocytic anemia, abnormalities in blood smears, and megaloblasts in bone marrow.

Uploaded by

lubna aloshibi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Lecture 11

Macrocytic and megaloblastic


Anemia.

 Macrocytic anemias are defined as red cells with MCV ≥

100 fl. They are broadly classified into megaloblastic

and non-megaloblastic.

 Megaloblastic anemia results from deficiency of either

folate or vitamin B12

 Folate and vitamin B12 are essential for synthesis of

deoxyribonucleic acid (DNA); in case of deficiency,

therefore, there is defective synthesis of DNA in all the

proliferating cells including bone marrow cells.

 Vitamin B12 is also required for neurological functions.

 Anemia, mild jaundice (due to ineffective erythropoiesis

or premature destruction of erythroid precursors in

bone marrow), and glossitis are common to both folate

and vitamin B12 deficiency.


 Neurologic features like symmetric paresthesiae

especially in lower limbs, reduced vibration sense,

ataxia, loss of memory, and personality change occur in

vitamin B12 deficiency but not in folate deficiency.

Laboratory Features :

• Macrocytic anemia (mean cell volume >100 fl in adults).

Elevation of mean cell volume is an early sign and precedes

the onset of anemia. Pancytopenia is common.

• Blood smear shows oval macrocytosis, basophilic stippling,

Howell-Jolly bodies, and hypersegmentation of neutrophils

(>5% of neutrophils showing 5 or more lobes) .

• Reticulocyte count is normal or low.

• Bone marrow shows megaloblasts, erythroid hyperplasia,

and giant metamyelocytes and bands .

• Vitamin assays.

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