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Laboratory Testing in Hemolytic Anemia

Intravascular vs Extravascular Hemolysis
Reticulocytes
Unconjugated bilirubin
LDH
Peripheral smear
Haptoglobin
Urine hemosiderin
Urine hemoglobin
Carboxyhemoglobin

#Hemolytic #Anemia #Laboratory #Testing #workup
Laboratory Testing in Hemolytic ... Extravascular Hemolysis ... Unconjugated bilirubin ... Carboxyhemoglobin #Hemolytic ... diagnosis #hematology #hemolysis
Hemolytic Anemias - Differential Diagnosis Algorithm

Signs of anemia and hemolysis:
 • ↓ Haptoglobin
 • ↑ LDH
Hemolytic Anemias ... of anemia and hemolysis ... / unconjugated bilirubin ... Immune-mediated Hemolysis ... • Autoimmune Hemolytic
Hemolysis - Diagnostic Algorithm and Causes

Increased red cell production: 
 • Increased Reticulocytosis/polychromasia 
 • Erythroid
Hemolysis - Diagnostic ... Increased Serum bilirubin ... haptogbbulin #Hemolysis ... #Hemolytic #Anemia
Approach to Neonatal Jaundice

Causes of pathologic hyperbilirubinemia can be classified as due to (1) increased bilirubin
(1) increased bilirubin ... pre-hepatic; either hemolytic ... or non-hemolytic ... , (2) impaired bilirubin ... or (3) impaired bilirubin
Warm Antibody Autoimmune Hemolytic Anemia 
1) DIAGNOSE AIHA
 • Anemia: macrocytic > normocytic, ↑ reticulocytes
 •
Antibody Autoimmune Hemolytic ... reticulocytes • Hemolysis ... haptoglobin ↑ indirect bilirubin ... Antibody #Autoimmune #Hemolytic
Biochemistry and Metabolism of Bilirubin
Hemolysis → Hemoglobin → Heme → Biliverdin → Unconjugated Bilirubin (a.k.a. "indirect
Metabolism of Bilirubin ... Hemolysis → Hemoglobin ... → Unconjugated Bilirubin ... "indirect bilirubin ... and "indirect" bilirubin
Classification of Jaundice
Unconjugated hyperbilirubinemia (predominantly indirect bilirubin)
 • Increased bilirubin production (eg, hemolytic anemias, hemolytic reactions,
predominantly indirect bilirubin ... • Increased bilirubin ... production (eg, hemolytic ... anemias, hemolytic ... ) • Impaired bilirubin
Inherited Non-hemolytic Disorders of Hyperbilirubinemia 

== Disorders of Conjugation ==
Gilbert Syndrome:
 • 5-10% of the population
Inherited Non-hemolytic ... without evidence of hemolysis ... birth with serum bilirubin ... associated with bilirubin ... in conjugated bilirubin
Liver Disease in Pregnancy
Intrahepatic Cholestasis of Pregnancy (ICP)
 • Onset/Trimester: 25-32 weeks
 • Typical clinical features:
fold elevation, Bilirubin ... HELLP Syndrome (Hemolysis ... clinical features: Hemolysis ... fold elevation, Bilirubin ... but variable ++, Bilirubin
TTP - Laboratory Evaluation for Thrombotic Thrombocytopenic Purpura

Activity of von Willebrand factor-cleaving protease activity - A
hemorrhage and hemolysis ... intravascular hemolysis ... out an immune hemolytic ... anemia Indirect bilirubin ... the severity of hemolysis