POLYCYTHAEMIA
PSEUDO or RELATIVE (i.e. due to loss of plasma):
Diarrhoea
Diuretics
Burns
TRUE:
With low erythropoietin:
Polycythaemia vera
Primary familial polycythaemia
With normal or high erythropoietin:
-With low oxygen saturation:
High altitude of residence
Cigarette smoking
Pulmonary disease
Cyanotic congenital heart disease
High affinity haemoglobin
Renal hypoxia
Low 2,3-DPG
Methaemoglobin
-With normal oxygen saturation:
Renal tumours/cysts
Androgens
Erythropoietin doping
Hepatocellular carcinoma
Cerebellar haemangioma
Pheochromocytoma
Conn syndrome
Cushing syndrome
Barter syndrome