HLA-B51 in Behçet's Disease Diagnosis

Diagnostic Value

HLA-B51 has a moderate positive predictive value (PPV) of approximately 55% and a high negative predictive value (NPV) of around 84-90% for Behçet's disease, making it more useful for excluding the disease than confirming it, as suggested by Circulation 1
The PPV of HLA-B51 for Behçet's disease is approximately 55%, indicating that many HLA-B51 positive individuals will not develop Behçet's disease, according to Annals of Oncology 2
The NPV of HLA-B51 for Behçet's disease is approximately 84-90%, making HLA-B51 testing more valuable for excluding Behçet's disease than for confirming it, as reported by Annals of Oncology and Journal of Allergy and Clinical Immunology 3, 2

HLA-B51 testing should not be used as a standalone diagnostic test for Behçet's disease but rather as supportive evidence, as recommended by Circulation 1

Testing methodology and quality can affect the accuracy of HLA typing results, as noted by Nature Protocols 4
The clinical utility of HLA-B51 testing must be interpreted in the context of the complete clinical presentation, as suggested by Circulation 1

Consider HLA-B51 testing as part of the diagnostic workup for suspected Behçet's disease, particularly in patients with incomplete clinical presentation, as recommended by Circulation 1
A negative HLA-B51 result should increase confidence in excluding Behçet's disease, especially when clinical features are equivocal, according to Annals of Oncology 2

The prevalence of HLA-B51 in the normal population varies significantly by ethnicity, ranging from less than 1% in some African populations to 10-15% in Han Chinese populations 5
In Caucasian populations, HLA-B51 prevalence is approximately 5-8% 5
In African and Asian populations, prevalence is generally lower at <1% 5
In African American populations, prevalence is approximately 2.5% 5
Han Chinese populations show higher prevalence rates of 10-15% 5

In moyamoya disease, HLA-B51 has been identified as one of several HLA antigens associated with the condition, particularly in patients over 10 years of age 6

HLA-B51 testing is not routinely recommended as a screening test for the general population 7
In patients with suspected Behçet's disease, HLA-B51 testing may provide supportive diagnostic information, though it is not included in the primary diagnostic criteria 8