Thrombocytosis

What it means

Increased numbers of platelets in the peripheral blood.

Thrombocythemia and thrombocytosis are conditions with a higher than normal number of platelets. The term "thrombocythemia" is preferred when the cause of a high platelet count isn't known. The condition sometimes is called primary or essential thrombocythemia.

Rare diseases that can present with this24

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Increased platelet count · Thrombocythaemia · Thrombocythemia