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Tareq Abadl: Extravascular Hemolysis The High-Yield Guide
Tareq Abadl/LinkedIn
Sep 3, 2026, 17:54

Tareq Abadl: Extravascular Hemolysis The High-Yield Guide

Tareq Abadl, Medical Lab Specialist, shared a post on LinkedIn:

“Extravascular Hemolysis

Where are the RBCs destroyed?

In extravascular hemolysis, RBCs are removed from circulation by macrophages, mainly in the spleen and liver.

What happens in the Lab?

  • High Indirect Bilirubin
  • Hemoglobin is broken down within macrophages, increasing bilirubin production.
  • High Reticulocytes
  • The bone marrow responds to increased RBC destruction by increasing RBC production.
  • High LDH
  • LDH may be elevated as a marker of hemolysis, but it is not specific for extravascular hemolysis.
  • Low Haptoglobin
  • Haptoglobin can decrease in hemolysis, but this finding occurs in both intravascular and extravascular hemolysis and should not be used alone to distinguish them.

Peripheral blood smear

Spherocytes may be seen, particularly in:

  • Hereditary spherocytosis
  • Warm autoimmune hemolytic anemia

Hemoglobinuria or Hemosiderinuria

These findings are more characteristic of intravascular hemolysis and are generally absent in typical extravascular hemolysis.

Common Examples

  • Warm autoimmune hemolytic anemia
  • Hereditary spherocytosis
  • Hypersplenism
  • Lab memory tip

Extravascular occurs in the spleen and liver

RBCs are broken down by macrophages, leading to heme breakdown and increased indirect bilirubin.

Remember:

Not every hemolysis marker tells you where the RBC was destroyed.

The mechanism plus peripheral smear plus urine findings should be interpreted together.”Tareq Abadl: Extravascular Hemolysis The High-Yield Guide

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