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Antibody to *Giardia lamblia* (IgG)

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

This test detects antibodies in your blood that your immune system produces in response to *Giardia lamblia*, a microscopic parasite that can cause intestinal infections.

Quick summary

["Helps diagnose giardiasis, a common intestinal infection often spread through contaminated water or food."]

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

Key facts at a glance

LOINC
34470-5
Short code
G lamblia Ag Bifl Ql
Synonyms
G lamblia Ag Bifl Ql
Category
chemistry
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 This Test Measures

The test looks for IgG antibodies, which your body makes after exposure to *Giardia lamblia*. These antibodies indicate past or ongoing infection, but they don’t confirm an active infection alone. A positive result suggests exposure, but other tests (like stool samples) may be needed to confirm active infection.

How It Works

Blood is drawn and analyzed using an immunoassay method to detect IgG antibodies against *Giardia lamblia*. This helps identify whether your immune system has encountered the parasite.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like stomach cramps, diarrhea, bloating, or nausea—especially if travel, contaminated food/water, or close contact with someone who has giardiasis is suspected.

What to Expect

You’ll have a simple blood draw, usually at a clinic or lab. Results may take a few days to a week, depending on lab processing times. Follow-up may include additional tests if needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Giardia

Frequently asked questions

A positive IgG result indicates past or current exposure to *Giardia lamblia*, but it doesn’t always mean you’re actively infected. Symptoms may appear weeks after exposure and can range from mild to severe. Chronic infection can lead to malnutrition or persistent digestive issues, especially in children or immunocompromised individuals.
This test is not used to diagnose active giardiasis directly but supports diagnosis alongside stool tests or other clinical findings.
How long do IgG antibodies stay in the blood after infection?
IgG antibodies can remain in your system for months to years after infection, as they provide long-term immunity. However, they may decrease over time if the infection resolves.
Can I get this test if I’m pregnant?
Yes, this test is generally safe during pregnancy. However, confirm with your healthcare provider before scheduling, as they may recommend additional testing for active 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