HLA-B51 test
Quick answer: This blood test checks whether you carry HLA-B51 (part of the HLA-B5 group), a gene marker on white blood cells. Doctors may order it to support a suspected diagnosis of Behcet's disease.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
How the test is done
- 1A nurse confirms your details and the HLA-B51 request
- 2A vein near your elbow is cleaned
- 3A needle collects a tube of blood
- 4The lab checks for the HLA-B51 gene marker
What your results can mean
Reading your report
Many healthy people carry HLA-B51, so the result only supports a diagnosis made on your symptoms.
If the result is outside the usual range
A positive result can support a diagnosis of Behcet's disease in someone with typical symptoms, such as repeated mouth and genital ulcers or eye inflammation. It is also common in healthy people, so it cannot diagnose Behcet's alone.
Who usually has this test
People with recurring mouth ulcers together with genital ulcers, eye inflammation or skin problems.
Risks and aftercare
Nothing special afterwards; like other gene markers, the result does not change over time.
Names and options
Also called: HLA B51, HLA B5, Behcet's gene test
Listed by the hospital as
- HLA B5 (EDTA (2) &HEPARIN (2))
Questions about this test
What is Behcet's disease?
It is a condition that causes inflammation of blood vessels, often showing as repeated mouth and genital ulcers, skin spots and eye inflammation.
Can you have Behcet's without HLA-B51?
Yes. Many people with Behcet's do not carry HLA-B51. The diagnosis is made mainly from your symptoms.
Is HLA-B51 the same as HLA-B5?
HLA-B51 is part of the broader HLA-B5 group. Older reports may say B5, while newer methods name B51 specifically.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
Reception
Waiting area
IVF lab
This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.