Hemolytic Anemia: Evaluation and Differential Diagnosis.

Area of Science:

• Hematology
• Internal Medicine

Background:

• Hemolytic anemia is characterized by accelerated red blood cell destruction.
• It can manifest as a chronic condition or a life-threatening emergency.
• It should be considered in the differential diagnosis of normocytic or macrocytic anemia.

Purpose of the Study:

• To provide a comprehensive overview of hemolytic anemia.
• To discuss the various mechanisms, clinical presentations, and diagnostic approaches.
• To classify the different types of hemolytic anemias.

Main Methods:

• Literature review of hemolytic anemia.
• Analysis of diagnostic criteria and laboratory findings.
• Classification of hemolytic anemia based on underlying causes.

Main Results:

• Hemolysis can occur intravascularly or extravascularly through various mechanisms.
• Clinical signs include anemia, jaundice, and tachycardia; lab tests show reticulocytosis, elevated LDH, and bilirubin.
• The direct antiglobulin test and peripheral blood smear are key diagnostic tools.

Conclusions:

• Hemolytic anemias are classified into hemoglobinopathies, membranopathies, enzymopathies, immune-mediated, and extrinsic nonimmune causes.
• Extrinsic causes encompass thrombotic microangiopathies, trauma, infections, systemic diseases, and oxidative stress.
• Medications and neonatal conditions are important considerations in hemolytic anemia diagnosis.