Skip to content

Anti-platelet Antibody Screening (Serum/Plasma) by Immunoassay

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

This test checks for the presence of antibodies that may interfere with blood clotting by targeting platelets, a common cause of certain bleeding disorders.

Quick summary

["Helps identify potential bleeding risks linked to autoimmune platelet destruction."]

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

Key facts at a glance

LOINC
63464-2
Short code
T palldm Ab SerPl IA-aCnc
Synonyms
T palldm Ab SerPl IA-aCnc
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 This Test Matters for You

Platelets are tiny blood cells that help stop bleeding. If your body produces antibodies against these platelets, it can lead to bleeding problems, even after minor injuries. This test screens for these antibodies to help doctors diagnose conditions like immune thrombocytopenia purpura (ITP) or other autoimmune bleeding disorders.

How the Test Works

A small blood sample is taken from your arm and sent to a lab. The lab uses an immunoassay method to detect specific antibodies that target platelets. This process identifies whether your blood contains these antibodies that could interfere with normal clotting.

What to Expect Before the Test

No special preparation is needed for this test. You may have a slight bruise or soreness at the needle site, but this usually goes away quickly. If you’re on blood thinners, let your doctor know before the test.

Possible Results and Next Steps

If the test shows antibodies are present, your doctor may order further testing or additional blood work to determine the cause of your bleeding issues. If no antibodies are found, other causes of bleeding may be investigated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Anti-platelet Antibody Screen

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend this test if you have unexplained bleeding, easy bruising, or prolonged bleeding from cuts. It’s also used in patients with autoimmune conditions or those who have received blood transfusions and develop unusual bleeding symptoms.
What does a positive result mean?
A positive result means your blood contains antibodies that may attack platelets, potentially causing bleeding problems. This finding helps guide treatment options, such as steroids, immune therapy, or blood transfusions, depending on the severity.
How often should I get this test?
The frequency depends on your symptoms and medical history. Your doctor will determine if repeat testing is needed, especially if you’re being treated for an autoimmune condition or bleeding disorder.
  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