Neopterin serves as a marker of cellular immune system activation. Measurement of neopterin concentration in the body fluids like blood serum, cerebro-spinal fluid or urine, provides information about activation of cellular immunity.
Cutaneous Basophil Hypersensitivity Test (CBHT) is a distinct form of Hypersensitivity reaction and widely used as an indicator of immunity status. Cutaneous Basophil Hypersensitivity is induced by intradermal injection of Phytohemagglutinin (PHA) and is measured by checking the skin swelling.