What are the types of Crigler-Najjar syndrome?

What are the types of Crigler-Najjar syndrome?

There are two types of Crigler-Najjar syndrome:

• Type 1 (CN1): Crigler-Najjar syndrome type 1 is very severe and life-threatening. Most children diagnosed with this condition don’t survive past childhood from complications of the condition.
• Type 2 (CN2): Crigler-Najjar syndrome type 2 is less severe than type 1. Children diagnosed with type 2 have a normal life expectancy due to mild symptoms.