The objective of the study was to examine the efficacy of these 10 warning signs in the prediction of defined PID among 563 children evaluated at 2 tertiary PID centers in northern England. Medical records were reviewed for 430 children with a defined PID and 133 children for whom thorough workup did not result in a diagnosis of a specific PID.
Factors most predictive of PID were
- A family history of immunodeficiency disease
- Sepsis treated with intravenous antibiotics in patients with neutrophil PID (primary immunodeficiency)
- Failure to thrive in children with T-lymphocyte PID. In simple terms, this means you just don’t grow.
- When these 3 signs were present, PID was correctly identified in 96% of patients with neutrophil and complement deficiencies and in 89% of children with T-lymphocyte immunodeficiencies.
- The only warning sign that correctly identified patients with B-lymphocyte PID was a positive family history. These are patients with NO antibody production–the “bubble boy”
“PID awareness initiatives should be targeted at hospital pediatricians and families with a history of PID rather than the general public,” the study authors write. “Our results provide the general pediatrician with a simple refinement of 10 warning signs for identifying children with underlying immunodeficiency diseases.”
“Delayed diagnosis of PID may be associated with increased morbidity and mortality,” the study authors conclude. “In children presenting with infection, pediatricians should always inquire about a family history of PID, as this is the best predictor that the patient may also have an underlying immunodeficiency….In those with recurrent or severe infections, clinical features other than family history are often not helpful and a lower threshold is required for requesting antibody testing in which the diagnosis of a B-cell immunodeficiency is suspected.”
Selective antibody deficiency shows up a little bit differently in that children will often have recurrent ear infections or sinus disease. A different disease altogether!
Pediatrics. Published online April 11, 2011.