Which laboratory tests are essential for confirming a diagnosis of CVID in a patient with recurrent infections?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 21 August 2025 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

The provided UK guidelines and PubMed literature do not specify the essential laboratory tests for confirming a diagnosis of common variable immunodeficiency (CVID) in a patient presenting with recurrent infections.

The available PubMed literature discusses aspects of common variable immunodeficiency such as cutaneous granulomas [ ] and an approach to CVID in horses [ ], but does not detail human diagnostic criteria or specific laboratory tests.

The UK guidelines provided cover coeliac disease , vitamin B12 deficiency , and bacterial meningitis , which are not directly related to the diagnostic laboratory tests for CVID.

Educational content only. Always verify information and use clinical judgement.