Skip to content

Human Leukocyte Antigen (HLA) Antibody Screening, Serum

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

This test checks for antibodies in your blood that may react against specific proteins found on certain white blood cells (leukocytes), often used in organ transplantation or blood compatibility evaluations.

Quick summary

["This screening helps identify potential immune responses that could affect transplant success or blood transfusion safety."]

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

Key facts at a glance

LOINC
45153-4
Short code
HLA Ab NFr Ser
Synonyms
HLA Ab NFr Ser
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 Might Be Ordered

Your healthcare provider may recommend this test if you’re preparing for an organ transplant, considering blood transfusions, or experiencing unexplained immune-related issues. It’s also used in fertility treatments or to assess compatibility in donor-recipient pairs.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. The test involves analyzing serum (liquid part of blood without blood cells).

How the Results Are Used

Results help determine if you have antibodies that could cause rejection of a transplanted organ or complications during a blood transfusion. Providers use these findings to guide treatment plans, such as immune-suppressive medications or donor selection.

Common Conditions Monitored

This test is primarily used in transplant medicine (e.g., kidney, heart, or bone marrow) to prevent rejection. It may also be used in blood banking to screen donors or patients for compatibility.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HLA Antibody Screen

Frequently asked questions

What does a positive result mean?
A positive result means your blood contains antibodies that could potentially react against certain proteins on donor cells. This may affect transplant success or require additional precautions during blood transfusions.
How often will I need this test?
Frequency depends on your medical condition. For transplant patients, tests may be done regularly (e.g., monthly or weekly) to monitor antibody levels. Your provider will outline a schedule based on your treatment plan.
Can lifestyle changes affect this test?
Generally, lifestyle factors like diet or exercise don’t directly impact HLA antibody screening results. However, certain medications (e.g., immunosuppressants) may influence antibody levels, so always discuss your medications with your healthcare team.
  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