HNY Policy and Pathway Repository - York

Female: Haematocrit >0.48 / Male: Haematocrit >0.52

Urgent referral if any of the following:

• Female: Hct>0.56 / Male: Hct >0.60 in the absence of congenital cyanotic heart disease
• Arterial or venous thromboembolism within the last 3 months
• Unexplained visual loss (also refer to eye clinic)
• Abnormal bleeding (if serious please discuss with the on call haematology team via switch)

If none of the above, then repeat in 2 months and consider secondary causes:

• Diuretics, testosterone replacement, anabolic steroids, empagliflozin, dapagliflozin
• Chronic hypoxia
• Smoking or alcohol excess
• Dehydration at the time of the test

If secondary causes present, address where possible (eg stop causative medications, lifestyle advice) and repeat in 3 months.

If no obvious secondary cause and persistently Hct >0.48 (female) / Hct>0.52 (male), send JAK2 and refer routinely to haematology.

Note: patients with erythrocytosis should not be given iron replacement.

None provided