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Deprecated C-Specific IgG Antibody, Qualitative

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

A qualitative test for detecting C-specific IgG antibodies in a patient sample. This deprecated test is rarely used and should be interpreted with clinical guidance.

Quick summary

["This historical test looks for C-specific IgG antibodies and reports whether they are detected."]

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

Key facts at a glance

LOINC
33281-7
Short code
Deprecated C specifera IgG RAST Ql
Synonyms
Deprecated C specifera IgG 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 is a qualitative laboratory test that looks for IgG antibodies directed against a C-specific target. A result is generally reported as detected or not detected rather than as a numeric concentration.

Why might I need this test?

C-specific IgG testing was historically used in selected evaluations of immune responses. Because this test is deprecated and is not part of many routine panels, it is usually ordered only for a specific clinical reason.

How is the test performed?

A laboratory analyzes a patient specimen using a validated antibody-detection method and compares the reaction with the test's interpretive criteria. The exact specimen and method should be confirmed with the ordering laboratory.

How do I prepare for the test?

No special preparation is generally described for a qualitative antibody test, but requirements can vary by specimen and laboratory. Follow the instructions provided by your healthcare professional or testing laboratory.

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

C-Specific IgG Antibody (Qualitative)

Frequently asked questions

What does a positive result mean?
It means C-specific IgG antibodies were detected in the specimen. This may indicate an immune response, but the finding must be interpreted alongside symptoms, history, and other tests.
Why is this test listed as deprecated?
It is a historical test that is no longer routinely recommended or widely available. A current, more specific test may be a better choice when clinically appropriate.
Can this test diagnose a condition on its own?
No. A qualitative antibody result is one piece of information and should be interpreted by a qualified healthcare professional using the full clinical context.
  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