Candida Antigen Quantitative (Serum/Plasma)
This test measures the presence of fungal antigens from *Candida* species in your blood, helping detect infections caused by yeast like *Candida albicans*.
["Detects bloodstream *Candida* infections, which can be life-threatening if untreated."]
Key facts at a glance
- LOINC
- 43067-8
- Short code
- CANDAB
- Synonyms
- Candida Ab Titr Ser
- Category
- chemistry
- Sample
- serum
- Container
- Serum Separator Tube (SST) or Red Top Tube
- Units
- N/A
- Ref low
- 0
- Ref high
- 1
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Enzyme Immunoassay (EIA) / Immunofluorescence Assay (IFA)
- CPT
- 86644
- SNOMED
- 122375008
- Specimen volume
- 1-2 mL serum (minimum 0.5 mL)
- Stability
- Room temperature: 8 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 30 days. Avoid repeated freeze-thaw cycles.
- Hemolysis max
- 100
- Lipemia max
- 200
- Icterus max
- 50
- TAT
- 24–96 hours
- Order
- routine
What Does This Test Measure?
The test identifies specific antigens produced by *Candida* yeast, which may indicate an active infection. These antigens are not always present in healthy individuals, so a positive result suggests infection but does not confirm the exact type of *Candida* species or severity. Blood cultures or other tests may be needed for further evaluation.
When Might You Need This Test?
Your healthcare provider may order this test if you have symptoms like fever, chills, or signs of infection (e.g., in the blood, lungs, or other organs). It’s also used in patients with weakened immune systems (e.g., due to HIV, chemotherapy, or organ transplants) or those with long-term medical devices (like catheters).
How Is the Test Performed?
A blood sample is drawn from a vein, typically in your arm. The sample is then analyzed in a lab to detect *Candida* antigens using a sensitive immunoassay method. Results are usually available within 24–48 hours.
What Are Possible Results?
A **negative** result means no detectable *Candida* antigens were found in your blood sample. A **positive** result suggests possible infection but does not confirm the diagnosis alone. Follow-up tests (like blood cultures) may be needed to confirm or investigate further.
Reference range
Titer <1:80 or negative; results reported as serial dilutions (e.g., 1:40, 1:80, 1:160, 1:320, 1:640). Titers ≥1:160 may suggest active or recent infection.N/A
No fasting required. Specimen should be collected prior to initiation of antifungal therapy when possible, as treatment may affect antibody titers.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Candida Blood Test
Frequently asked questions
Why was this test ordered?
What does a positive result mean?
Could this test cause side effects?
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