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Type A Blood Group Antibody Screening (Serum/Plasma)

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

This test checks for antibodies in your blood that may react with type A red blood cells, helping ensure compatibility for blood transfusions or pregnancy-related blood work.

Quick summary

["Helps prevent transfusion reactions by identifying unexpected antibodies in your bloodstream."]

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

Key facts at a glance

LOINC
34532-2
Short code
Type + Ab Scn Pnl Bld
Synonyms
Type + Ab Scn Pnl Bld
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 planning a blood transfusion, have unexplained anemia, or are pregnant. It’s also used in organ transplantation to check for potential immune responses.

What to Expect During the Test

A small blood sample is drawn from a vein in your arm. The sample is tested for antibodies that could react with type A red blood cells. Results are typically available within 24–48 hours.

How the Results Are Interpreted

Positive results indicate the presence of antibodies that could cause complications during transfusions or pregnancy. Negative results mean no significant antibodies were detected in this test.

Common Causes or Triggers

Antibodies may develop after blood transfusions, pregnancy, or exposure to certain infections. Some people are naturally born with these antibodies due to genetic factors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

ABO Antibody Screen

Frequently asked questions

What does a positive result mean?
A positive result means your blood contains antibodies that could react with type A red blood cells. This may require additional testing or special precautions during blood transfusions or pregnancy.
How often should I get this test?
The frequency depends on your medical needs. Your healthcare provider will determine how often you need this test based on your condition, such as pregnancy status, planned transfusions, or ongoing health monitoring.
Can lifestyle changes affect this test?
Generally, lifestyle factors like diet or exercise do not directly influence antibody levels detected in this test. However, underlying conditions (e.g., autoimmune diseases) may indirectly affect results.
  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