Test Background IgG antibody levels to Haemophilus influenzae are requested as part of an immune deficiency screen for patients with recurrent or opportunistic infections. This test is only available for patients <4 years of age, and should be performed alongside pneumococcal and tetanus toxoid antibodies.
Only pneumococcal and tetanus toxoid antibodies should be tested in patients >4 years of age.
Clinical Indications Assessment of an antibody response to haemophilus vaccine
Aiding the diagnosis of immunodeficiency (acquired, congenital or iatrogenic, ie. following administration of immunosuppressive agents)
Haemophilus influenza type b post-vaccination immune status in sickle-cell, immunocompromised or other select patients in whom recurrent episodes of pneumococcal/haemophilus infection have been observed