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Aspergillus Antigen (Serum) – Quantitative

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

This test measures the presence of fungal antigens in your blood, which may indicate an active infection with *Aspergillus* fungi—a common mold found in the environment.

Quick summary

["Helps diagnose mold infections that may not show up on other tests."]

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

Key facts at a glance

LOINC
31655-4
Short code
Deprecated S pneum9 Ab Ser-aCnc
Synonyms
Deprecated S pneum9 Ab Ser-aCnc
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Does This Test Measure?

The test detects specific fungal antigens (proteins) released by *Aspergillus* fungi during infection. These antigens circulate in your blood if the mold has invaded your body, often in the lungs or other tissues.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like persistent cough, fever, or lung issues (e.g., pneumonia, asthma flare-ups) and suspect a fungal infection, especially if you live in or visit moldy environments.

Who Should Consider This Test?

People at higher risk include those with weakened immune systems (e.g., HIV/AIDS, chemotherapy patients), chronic lung diseases (e.g., cystic fibrosis, COPD), or recent transplant recipients.

What to Expect Before the Test

No special preparation is needed. A blood sample is drawn from a vein, usually in your arm. The test is typically done in a lab and results may take a few days to a week.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Aspergillus Antigen Test

Frequently asked questions

Early detection is critical because *Aspergillus* infections can be serious. High antigen levels may signal active infection, guiding treatment decisions like antifungal medications.
This test helps differentiate fungal infections from bacterial or viral causes, especially in immunocompromised patients where symptoms may be subtle.
Is this test covered by insurance?
Coverage depends on your diagnosis and insurance plan. Check with your provider or insurance company to confirm if this test is medically necessary for your situation.
How long does it take to get results?
Results are usually available within 1–7 days, but timing varies by lab. Your doctor will discuss findings with you during your follow-up visit.
  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