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Candida albicans IgG4 Antibody, Qualitative — Radioallergosorbent Test (RAST)

Published: August 9, 2026Updated: August 17, 2026

A qualitative blood test that detects Candida albicans-specific IgG4 antibodies using a radioallergosorbent method.

Quick summary

["A positive result shows a Candida albicans-specific IgG4 antibody response, but it does not by itself confirm an active infection."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
26414-3
Short code
Deprecated C albicans IgG4 RAST Ql
Synonyms
Deprecated C albicans IgG4 RAST Ql
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
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?

This test looks for IgG4 antibodies directed against Candida albicans, a type of yeast. It is reported qualitatively, generally as detected or not detected.

Why might I need this test?

It may be used to evaluate whether a patient has developed an immune response to Candida albicans. A clinician interprets the result together with symptoms, medical history, and other laboratory findings.

How is the test performed?

A blood sample is collected, and the laboratory uses a radioallergosorbent testing method to detect Candida albicans-specific IgG4 antibodies. The result is reported as present or absent rather than as a measured concentration.

How do I prepare for the test?

No special preparation is usually required. Tell your healthcare professional if you are taking immunosuppressive medicines, recently received biologic treatments, or have another condition that could affect antibody production.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Candida albicans IgG4 antibody test

Frequently asked questions

Does a positive result mean I have a Candida infection?
Not necessarily. It shows a specific antibody response, which can occur with past exposure and does not by itself confirm an active infection.
What does a negative result mean?
It means detectable Candida albicans-specific IgG4 antibodies were not found at the time of testing. A negative result does not completely exclude infection or exposure.
Is this the same as a Candida culture?
No. This test detects antibodies in blood, while a culture tries to grow Candida from a sample such as blood, urine, or swabbed material.
  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 17, 2026. · Read our editorial policy