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Diagnosis

Early diagnosis of SCID is usually difficult due to the need for advanced screening techniques. Several symptoms may indicate a possibility of SCID in a child, such as a family history of infant death, chronic coughs, hyperinflated lungs, and persistent infections. A full blood lymphocyte count is often considered a reliable manner of diagnosing SCID, but higher lymphocyte counts in childhood may influence results. Clinical diagnosis based on genetic defects is also a possible diagnostic procedure that has been implemented in the UK.