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Candida antigen in serum/plasma (quantitative)

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

This test measures the presence of a fungal protein produced by *Candida* yeast, which can help detect active infections.

Quick summary

["A positive result may indicate a fungal infection requiring medical evaluation."]

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

Key facts at a glance

LOINC
29722-6
Short code
C pneum Ag Spec Ql IF
Synonyms
C pneum Ag Spec Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects a specific protein (antigen) released by *Candida* yeast during active infection. This protein is not found in healthy individuals, making it useful for identifying *Candida* infections in the blood or other tissues.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like fever, fatigue, or signs of a systemic infection, especially if you have a weakened immune system, recent surgery, or other risk factors for fungal infections.

Common Uses

This test is particularly useful for diagnosing *Candida* bloodstream infections in patients with conditions like cancer, HIV/AIDS, or those on long-term antibiotics or steroids.

What to Expect

A blood sample is drawn from a vein, typically in your arm. The sample is processed to detect the fungal antigen using a sensitive immunoassay method.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Candida antigen

Frequently asked questions

How soon will I get results?
Results are usually available within 24 to 48 hours, depending on lab processing times. Your healthcare provider will discuss the meaning of your results with you.
Can I take anything before this test?
No special preparation is needed, but inform your provider about any medications, supplements, or recent illnesses that could affect results.
Is this test painful?
The blood draw may cause mild discomfort or bruising, but it is generally well-tolerated. Most people experience only minor side effects, like a slight pinch or soreness at the injection site.
  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