reticulocytosis - present if there is increased red cell production
blood film:
polychromasia, macrocytosis: increased red cell production
spherocytosis: hereditary spherocytosis
elliptocytosis: hereditary elliptocytosis
sickle cells
bilirubin - increased in unconjugated bilirubin if there is increased red cell destruction (also increased urinary urobilinogen and reduced haptoglobin)
LDH: increased if red cell destruction
urine:
urobilinogen: high if increased RBC destruction
haemoglobinuria, haemosiderinuria: present in intravascular causes of RBC destruction
Other tests:
Coomb's test - tests for autoimmune cause of haemolytic anaemia
Donath-Landsteiner antibody - if paroxysmal cold haemoglobinuria
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