Antibody Screening for Anticardiolipin (IgG) in Serum
This test measures the presence of antibodies called anticardiolipin in your blood, which may be linked to certain autoimmune conditions or blood clotting issues.
["Anticardiolipin antibodies can help identify potential risks for blood clots or autoimmune disorders."]
Key facts at a glance
- LOINC
- 105809-8
- Short code
- CFR
- Synonyms
- Bac antimicro res CFR Ct Bld +
- Category
- chemistry
- Sample
- whole-blood
- Container
- Positive blood culture bottle (aerobic or anaerobic) transferred to a sterile, leak-proof molecular transport tube or cryovial
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- CPT
- 87798
- SNOMED
- 43491000
- Specimen volume
- 1-3 mL of positive blood culture broth; minimum 0.5 mL
- Stability
- Stable at 2-8°C for up to 24 hours after blood culture positivity; for longer delays, freeze at -70°C to -80°C. Do not freeze at -20°C.
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 2–8 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms like unexplained blood clots, recurrent miscarriages, or signs of an autoimmune condition. It could also be part of a broader evaluation for conditions like lupus or thrombophilia.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. It usually takes a few minutes, and you may feel a brief pinch. Avoid heavy exercise or smoking for a few hours before your appointment.
What the Test Results Mean
Results are qualitative (positive or negative) and indicate whether your blood contains detectable levels of anticardiolipin antibodies. Elevated levels may suggest an increased risk for blood clots or autoimmune activity, but they don’t diagnose a specific condition alone.
Possible Follow-Up Actions
If your test is positive, your doctor may order additional tests or monitoring, such as checking for other autoimmune markers or evaluating your risk for clotting. They may also recommend lifestyle changes or medications to manage symptoms.
Reference range
Negative for cfr resistance gene. Cycle threshold (Ct) values are reported when positive; lower Ct values indicate higher bacterial load.N/A
No special patient preparation required. Testing is performed on positive blood culture specimens, not direct patient draws.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Anticardiolipin Antibody (IgG) Screen
Frequently asked questions
What Does a Positive Result Indicate?
What Does a Negative Result Mean?
Can This Test Be Used to Diagnose Autoimmune Diseases?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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