Hyperhistidinemia

What it means

The concentration of histidine in the blood circulation is above the upper limit of normal.

Blood histidine levels over 500 micromole per liter. Normal blood histidine levels are around 80-90 micromole per liter.

Rare diseases that can present with this1

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: Elevated histidine concentration · Elevated histidine level · Elevated histidine level in blood · Histidinemia · Increased histidine concentration · Increased histidine level · Increased histidine level in blood