No definitive medical test is known for<unk> . Rather, diagnosis is made by excluding all other possible causes of the patient's itching, including polycythemia vera. Since pruritus is a symptom of many serious diseases, it is important to rule out other causes before making a final diagnosis.
Aquagenic pruritus
Psychogenic pruritus
Uremic pruritus
Cholestatic pruritus
Hydroxyethyl starch-induced pruritus
Pathergy
Grocer's itch
Irritant diaper dermatitis