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Antibody Screening for Blood Group (ABO) System (Qualitative)

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

This test checks for antibodies in your blood that could cause a reaction if you receive blood from a different blood type during a transfusion.

Quick summary

["Helps ensure safe blood transfusions by detecting unexpected antibodies."]

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

Key facts at a glance

LOINC
877-1
Short code
Deprecated A,B Ab Ser Ql
Synonyms
Deprecated A,B Ab Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
aggl-rbc
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 before a blood transfusion to prevent complications like hemolysis (destruction of red blood cells) or allergic reactions. It’s also used in pregnancy to check for ABO incompatibility risks.

How the Test Works

A small sample of your blood is mixed with known blood cells of different ABO types. If antibodies are present, they’ll react with the wrong blood cells, causing visible clumping. This reaction confirms the presence of antibodies.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm for blood collection, similar to a routine blood draw. The process takes about 5 minutes.

Possible Results and Next Steps

A positive result means antibodies are detected. Your provider will work with a blood bank to ensure you receive compatible blood during a transfusion. A negative result means no antibodies were found in this test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

ABO Antibody Screen (Qualitative)

Frequently asked questions

If antibodies are found, they may indicate a need for special blood products or closer monitoring during transfusions. In pregnancy, certain antibodies can affect fetal health, so follow-up testing may be needed.
This test is a routine screening step to prevent serious transfusion reactions. It’s not a diagnostic test for blood type incompatibility alone but is critical for patient safety.
What does a positive result mean?
A positive result means your blood contains antibodies that could react with incompatible blood types during a transfusion. Your healthcare provider will adjust your blood donation or transfusion plan accordingly.
Can I get this test at home?
No, this test is typically done in a clinical lab setting. Blood samples are collected by a healthcare professional.
  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