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Serum/Plasma Line Blot Analysis for Antibodies Against Antiphospholipid Antigens (Qualitative)

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

This test detects antibodies that may be linked to conditions like lupus or other autoimmune diseases by analyzing your blood for specific proteins.

Quick summary

["Helps identify potential autoimmune or inflammatory conditions by screening for unusual antibody responses."]

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

Key facts at a glance

LOINC
89526-8
Short code
ENA SS-B Ab CSF Ql Line blot
Synonyms
ENA SS-B Ab CSF Ql Line blot
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
line-blot
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

A line blot assay examines your serum or plasma for antibodies targeting phospholipid-binding proteins. This method detects a range of antiphospholipid antibodies, including lupus anticoagulant, cardiolipin, and beta-2-glycoprotein I antibodies, which can be associated with autoimmune disorders.

Why It’s Ordered

Your doctor may recommend this test if you have symptoms like blood clots, unexplained miscarriages, or persistent inflammation. It’s also used to monitor conditions like antiphospholipid syndrome (APS) or lupus.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in the arm. The blood is processed to separate serum or plasma, which is then analyzed in a lab using the line blot technique.

What to Expect Before the Test

No special preparation is needed, but inform your doctor about any medications, especially blood thinners, as they may affect results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test plays a key role in diagnosing or confirming autoimmune conditions linked to antiphospholipid antibodies. Positive results may prompt further testing, like confirmatory assays, to guide treatment decisions.

Short name

Line Blot Antibody Screen (APA)

Frequently asked questions

What does a positive result mean?
A positive result indicates the presence of antibodies that may suggest an autoimmune or inflammatory condition. However, further testing is usually needed to clarify the cause and next steps.
Can this test be done at home?
No, this test requires a lab sample collected by a healthcare professional. It’s not a self-test.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times.
  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