The World Health Organization (WHO) diagnostic criteria for Polycythemia Vera (PV), initially published in 2001 and 2008, were last revised in 2016. According to these criteria, evaluation for PV is recommended when haemoglobin (Hb) levels exceed 16.5 g/dL (10.24 mmol/L) in men and 16.0 g/dL (9.93 mmol/L) in women, or when hematocrit (Hct) levels are greater than 49 % in men and 48 % in women [1].
