Abdul Mannan: When the Spleen Takes a Bite: The Mystery of Heinz Bodies
Dr Abdul Mannan, Consultant Haematologist at Betsi Cadwaladr University Health Board, posted on LinkedIn:
“When the Spleen Takes a Bite: The Mystery of Heinz Bodies
We often look at a peripheral smear and spot a “Bite Cell” (Degmacyte), but the story behind that bite is a fascinating journey of cellular stress.
What is actually happening?
It starts with Oxidative Stress. When hemoglobin is exposed to oxidants (like certain drugs or in G6PD deficiency), it denatures and precipitates. These clumps of damaged hemoglobin are called Heinz Bodies.
As these rigid cells try to pass through the splenic cords, the splenic macrophages identify the inclusion and “pit” it out—literally taking a bite out of the cell to remove the damage.
The Haematologist’s Pearl:
Remember, you won’t see the Heinz Body itself on a standard Romanowsky stain (they are invisible!). You need a “supravital stain” like New Methylene Blue to visualize them. On a standard smear, the “Bite Cell” is your clue that Heinz bodies were there.
Common Culprits:
G6PD Deficiency (Classic cause)
Oxidant drugs (Dapsone, Primaquine)
Unstable Hemoglobinopathies
A beautiful example of splenic function and red cell pathology in one image!”
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