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Fungal Antigen Detection by Qualitative Gene Probe (Serum/Plasma)

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

This test detects specific fungal antigens in your blood to help identify infections caused by certain fungi, such as cryptococcosis.

Quick summary

["This test helps doctors diagnose fungal infections early and guide treatment decisions."]

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

Key facts at a glance

LOINC
91087-7
Short code
Fungal BT2 gene Islt Ql NAA+probe
Synonyms
Fungal BT2 gene Islt Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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 Is This Test Measuring?

The test looks for the presence of fungal antigens—small molecules released by certain fungi—using a specialized molecular probe. These antigens are not the same as antibodies your immune system produces in response to infection.

Why Might Your Doctor Order This Test?

Your doctor may recommend this test if you have symptoms like fever, cough, or neurological issues and suspect a fungal infection, especially in high-risk groups (e.g., immunocompromised patients). It’s also used in screening or confirming infections like cryptococcal meningitis.

How Is the Sample Collected?

A blood sample is drawn from a vein in your arm. The blood is processed to separate the serum or plasma, which is then tested for fungal antigens.

What Does a Positive Result Mean?

A positive result indicates the presence of fungal antigens, suggesting an active fungal infection. However, it doesn’t specify which fungus is causing the infection, so further testing may be needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is critical for diagnosing fungal infections in patients who may not have classic symptoms or where other tests are inconclusive. Early detection improves treatment outcomes and reduces complications.

Short name

Fungal Antigen Probe Test

Frequently asked questions

How soon can I expect results?
Results are typically available within 24 to 48 hours, depending on lab processing times. Your doctor will discuss the results with you during your follow-up visit.
What if my test is positive?
A positive result means you likely have a fungal infection. Your doctor will work with you to determine the best treatment plan, which may include antifungal medications. Follow-up tests may be needed to monitor your response to treatment.
Does this test require fasting?
No fasting is required for this test. However, always follow your doctor’s instructions for any specific preparation before your blood draw.
  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