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Fungal Antigen (Serum) – Quantitative

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

This test measures the presence of fungal antigens in your blood, which can help identify infections caused by certain fungi, such as cryptococcosis or histoplasmosis.

Quick summary

["This test helps diagnose fungal infections that may not show up with other tests."]

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

Key facts at a glance

LOINC
98025-0
Short code
Fungus Prost fld Fungus Stn
Synonyms
Fungus Prost fld Fungus Stn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
fungus-stain
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

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like fever, fatigue, or respiratory issues, especially if you live in an area with known fungal exposure or have a weakened immune system. It’s also used to monitor treatment progress in people with chronic fungal infections.

What Does the Test Involve?

A blood sample is taken from a vein in your arm. The sample is then analyzed to detect specific fungal antigens, which are molecules produced by certain fungi that your immune system can recognize.

How Are Results Interpreted?

Results are typically reported as either positive or negative for fungal antigen presence. A positive result suggests an active fungal infection, while a negative result means no detectable fungal antigens were found in this sample.

What Are Possible Outcomes?

A positive test result may indicate an infection that requires further testing or treatment. A negative result does not definitively rule out a fungal infection, so your provider may recommend additional tests or follow-up.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fungal Antigen Test

Frequently asked questions

What Does a Positive Test Mean for My Health?
A positive result suggests you may have an active fungal infection. Your healthcare provider will work with you to determine the best course of treatment, which may include antifungal medications.
Will This Test Show All Types of Fungal Infections?
This test specifically detects certain fungal antigens, so it may not identify all types of fungal infections. Other tests or imaging may be needed for a complete diagnosis.
How Often Should I Get This Test?
Your healthcare provider will decide how often you need this test based on your medical history, symptoms, and treatment plan. Follow-up tests may be scheduled if you’re being treated for a fungal infection.
  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