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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 ... Reticulocytes ... LDH Peripheral smear ... Carboxyhemoglobin #Hemolytic
Hemolytic Anemias - Differential Diagnosis Algorithm

Signs of anemia and hemolysis:
 • ↓ Haptoglobin
 • ↑ LDH
Hemolytic Anemias ... of anemia and hemolysis ... bilirubin • ↑ Reticulocytes ... Abnormal peripheral smear ... Immune-mediated Hemolysis
Pancytopenia - Differential Diagnosis Algorithm
 • 12-13 g/dL,
 • ANC < 1800/uL,
 • platelet < 150,000/uL

Initial
acid, peripheral smear ... , reticulocyte count ... Production (↓ reticulocytes ... ↑ Destruction (hemolysis ... , ↑ reticulocytes
Warm Antibody Autoimmune Hemolytic Anemia 
1) DIAGNOSE AIHA
 • Anemia: macrocytic > normocytic, ↑ reticulocytes
 •
Antibody Autoimmune Hemolytic ... normocytic, ↑ reticulocytes ... • Hemolysis: ... C3d • Blood smear ... Antibody #Autoimmune #Hemolytic
Algorithm for the evaluation of macrocytic anemia. (RBC = red blood cell; MMA = methylmalonic acid.)
Physicians
ordering a peripheral smear ... , a reticulocyte ... specifically order a reticulocyte ... Hemorrhage or hemolysis ... elevation in the reticulocyte
Hemolysis - Differential Diagnosis Framework

1) Environment
  - Fragmentation
  - MAHA: TTP, HUS, DIC, HELLP
Hemolysis - Differential ... Peripheral Blood Smear ... abnormal RBCs - Reticulocyte ... Urobilinogen #Hemolysis
Calculating a Reticulocyte Index (RI)
Reticulocyte Index = Absolute Reticulocyte Count / Maturation Correction
Absolute Reticulocyte Count =
Calculating a Reticulocyte ... Index (RI) Reticulocyte ... Index = Absolute Reticulocyte ... Count = % of reticulocytes ... SatyaPatelMD #Reticulocyte
Approach to Thrombotic Microangiopathy (TMA) - Differential Diagnosis and Management Algorithm

Suspected TMA: Unexplained thrombocytopenia + MAHA
labs: CBC, BMP, Reticulocytes ... , smear, Haptoglobin ... MAHA likely: • Smear ... schistocytes > 1% • ↑ Reticulocyte
Anemia Diagnostic Algorithm

Mean corpuscular (cell) volume (MCV): Average RBC size. Under 80 = microcytic. Between 80-95
Reticulocyte count ... percentage of reticulocytes ... acute blood loss, hemolysis ... Corrected reticulocyte ... count OR reticulocyte
Hemolytic Anemia - Differential Diagnosis Algorithm
Hereditary:
 • Peripheral blood smear + DAT + further History
 •
Hemolytic Anemia ... Peripheral blood smear ... Immune mediated hemolysis ... Microangiopathic hemolytic ... UnremarkableLab #Hemolytic