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Human Leukocyte Antigen (HLA) Antibody Screening, Serum

Published: August 9, 2026Updated: August 16, 2026

This test helps detect antibodies in your blood that may react against certain cells in organs or tissues, often used before organ transplants to assess compatibility.

Quick summary

["This screening helps ensure safe organ matching for transplant procedures."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
48501-1
Short code
HLA Ab Ser Ql IA
Synonyms
HLA Ab Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Doctors may order this test if you’re a potential organ donor or recipient, particularly before procedures like kidney transplants. It helps identify if your immune system might reject a donated organ by checking for antibodies that could cause problems.

What Does the Test Measure?

The test measures the presence of antibodies in your serum that could target specific HLA proteins found on donor cells. These antibodies are part of your immune system’s response and may affect how well an organ will function post-transplant.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The serum portion of your blood is then tested using an immunoassay method to detect antibodies against various HLA antigens.

What Are the Next Steps?

If antibodies are found, further testing (like confirmation) may be needed to determine their level and specific targets. This helps guide decisions about organ compatibility and potential transplant planning.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is critical in transplant medicine to prevent rejection. Positive results may indicate a higher risk of immune-mediated complications, prompting closer monitoring or adjustments to pre-transplant treatment plans.

Short name

HLA Antibody Screen

Frequently asked questions

What does a positive result mean?
A positive result means your blood contains antibodies that may react against donor cells. This doesn’t always mean a transplant won’t work, but it may require additional testing or specialized matching to reduce risks.
How often should I get this test?
The frequency depends on your situation—whether you’re a donor, recipient, or under observation for transplant. Your healthcare team will determine how often you need retests based on your medical needs.
Can lifestyle changes affect this test?
Lifestyle factors like diet, stress, or infections may indirectly influence immune responses, but they don’t directly alter HLA antibody levels. Focus on managing overall health for transplant readiness.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy