Candida Antigen in Serum (Quantitative)
This test measures the presence of fungal antigens from *Candida* species in your blood serum, helping detect fungal infections like candidiasis.
["This test helps diagnose serious fungal infections that may require treatment."]
Key facts at a glance
- LOINC
- 35271-6
- Short code
- CANDAG
- Synonyms
- Candida Ag Ser Ql LA
- Category
- chemistry
- Sample
- serum
- Container
- Serum separator tube (SST) or red-top tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Latex agglutination
- CPT
- 87449
- SNOMED
- 122706005
- Specimen volume
- 1-2 mL serum
- Stability
- Stable for 7 days at 2-8°C; store at -20°C for longer storage
- Hemolysis max
- 200
- Lipemia max
- 100
- Icterus max
- 50
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
The test detects specific antigens produced by *Candida* yeasts in your blood. These antigens are not present in healthy individuals but can appear if *Candida* has spread beyond the mouth, skin, or gut into the bloodstream, causing a systemic infection.
When You Might Need This Test
Your healthcare provider may order this test if you have symptoms like fever, chills, or unexplained infections, especially if you have a weakened immune system (e.g., from HIV/AIDS, chemotherapy, or long-term steroid use), recent surgery, or a history of fungal infections.
How the Test Works
Blood is drawn and analyzed using an immunoassay method to identify the fungal antigens. This helps confirm a diagnosis of invasive candidiasis, which can be life-threatening if untreated.
What to Expect Before the Test
No special preparation is needed. You may have a small needle inserted into your arm to draw blood. If you’re on blood-thinning medication or have a history of bleeding issues, let your provider know.
Reference range
NegativeN/A
No special preparation required
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results indicate a high likelihood of *Candida* infection in the bloodstream, which requires immediate medical attention. Negative results mean no detectable antigens, but further testing (e.g., cultures) may still be needed to rule out infection or guide treatment decisions.
Short name
Candida Antigen Test
Frequently asked questions
Why might my doctor order this test?
What does a positive result mean?
Can I get this test at home?
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 15, 2026. · Read our editorial policy