Nitroblue Tetrazolium

**Definition:** Colorless to yellow dye that is reducible to blue or black formazan crystals by certain cells; formerly used to distinguish between nonbacterial and bacterial diseases, the latter causing neutrophils to reduce the dye; used to confirm diagnosis of chronic granulomatous disease.

**Tree numbers:** - D03.383.129.617.700.500

**Synonyms:** - Tetrazolium Nitroblue - Nitro-BT - Nitrotetrazolium Blue