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Human Leukocyte Antigen (HLA) Antibody Screening, Serum/Plasma

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

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

Quick summary

["Identifies potential immune reactions that could affect transplant success or blood safety."]

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

Key facts at a glance

LOINC
34960-5
Short code
HLA Ab SerPl
Synonyms
HLA Ab SerPl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 This Test Is Done

Your healthcare provider may order this test if you’re preparing for an organ transplant, have had a recent blood transfusion, or are experiencing unexplained symptoms like swelling, pain, or organ rejection. It helps ensure compatibility and monitor immune responses.

What to Expect Before the Test

You’ll likely have a simple blood draw from a vein in your arm. No special preparation is needed, but inform your provider about any medications or recent illnesses.

How the Test Works

Blood is tested for antibodies (proteins that fight infections) that could attack specific cells, such as those in organs or red blood cells. Results help guide decisions about transplant compatibility or transfusion safety.

What the Results Mean

Positive results indicate the presence of antibodies that may need further evaluation or management. Negative results suggest no immediate concern, but ongoing monitoring may still be recommended.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is critical in transplant medicine to prevent rejection or graft-versus-host disease. In blood banking, it ensures donor-recipient compatibility and reduces risks of adverse reactions.

Short name

HLA Antibody Screen

Frequently asked questions

What causes my body to produce these antibodies?
Antibodies can develop due to prior infections, exposure to foreign cells (e.g., from blood transfusions or pregnancies), or autoimmune conditions. Your provider may explore triggers based on your medical history.
Can I stop taking medications before the test?
Check with your provider first, as some medications (e.g., immunosuppressants) may affect results. Never discontinue them without guidance.
How long will I need to wait for results?
Results are typically available within 1–3 business days, depending on lab processing. Follow-up may be scheduled if further testing is needed.
  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