22q11.2 deletion syndrome laboratory findings

22q11.2 deletion syndrome Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]

Overview

Patients diagnosed with or suspected of having DGS should undergo extensive evaluation, particularly if life-threatening cardiac or immunologic deficits are present.

Testing for CBC, T and B lymphocyte panels, Echocardiography, Immunoglobulin levels, Calcium levels are some of the main ones for evaluating DGS.

Laboratory Findings

Patients diagnosed with or suspected of having DGS should undergo extensive evaluation, particularly if life-threatening cardiac or immunologic deficits are present. The following tests should merit consideration:

Echocardiogram to evaluate conotruncal abnormalities

Complete blood count with differential

T and B Lymphocyte subset panels

Flow cytometry to assess T cell repertoire

Immunoglobulin levels

Vaccine titers for evaluation of response to vaccines

Serum ionized calcium and phosphorus levels

Parathyroid hormone level

Chest x-ray for thymic shadow evaluation

Renal ultrasound for possible renal and genitourinary defects

Serum creatinine

TSH

Testing for growth hormone deficiency

It is important to note that the broad spectrum of disease severity makes the evaluation of DGS particularly challenging. Cases involving significant cardiac, thymic, and craniofacial deficits are more easily recognizable than those lacking severe features. Implementation of advancing genomic studies and facial recognition technology in modern medicine may assist in more effective diagnosis and evaluation of DGS patients.