Beta-2 glycoprotein I antibody test
Quick answer: This blood test measures antibodies against beta-2 glycoprotein I, one of the antiphospholipid antibodies. Doctors usually order it with anticardiolipin and lupus anticoagulant tests after unexplained clots or recurrent pregnancy loss.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
- In fertility carePersistent antiphospholipid antibodies are linked to recurrent miscarriage and other pregnancy complications, so they are often checked after repeated losses.
How the test is done
- 1You sit and your arm is rested on a support
- 2The nurse cleans a vein and inserts a fine needle
- 3One tube of blood is collected
- 4The lab measures IgG and IgM antibodies to beta-2 glycoprotein I
What your results can mean
Reading your report
A single positive result is not enough for a diagnosis; doctors usually repeat it at least 12 weeks later and read it with your history.
If the result is outside the usual range
Persistently raised levels can point to antiphospholipid syndrome and a higher chance of clots or pregnancy complications. A positive result on all three antiphospholipid tests is linked with the highest risk.
Who usually has this test
People being checked for antiphospholipid syndrome after clots or pregnancy loss, usually with anticardiolipin and lupus anticoagulant tests.
Risks and aftercare
Bruising is usually minor, though it can be larger if you take blood thinners.
Names and options
Also called: anti-beta2 GP1, beta 2 GPI, anti-B2GP1
Options
- IgA
- IgG
- IgM
Listed by the hospital as
- BETA-2 GLYCOPROTEIN I, IGA
- BETA-2 GLYCOPROTEIN I, IGG
- BETA-2 GLYCOPROTEIN I, IGM
Questions about this test
Why test beta-2 glycoprotein I as well as anticardiolipin?
Beta-2 glycoprotein I is the protein many antiphospholipid antibodies actually target. Testing it adds specificity, and some people are positive on only one of the two tests.
What does triple positive mean?
It means lupus anticoagulant, anticardiolipin and beta-2 glycoprotein I tests are all positive. This pattern carries a higher chance of clots and pregnancy problems, so doctors plan care closely.
Can treatment help pregnancy if this test is positive?
When antiphospholipid syndrome is confirmed, doctors often advise low-dose aspirin and heparin injections in pregnancy. Your doctor will explain whether this applies to you.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
Reception
Waiting area
IVF lab
This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.