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Antibody to *Giardia lamblia* (IgG) – Serum

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

This test measures your immune system’s response to *Giardia lamblia*, a microscopic parasite that can cause intestinal infections.

Quick summary

["It helps diagnose giardiasis, a common stomach and bowel 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
40713-0
Short code
G lamblia IgG Ser Ql IA
Synonyms
G lamblia IgG Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
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 detects IgG antibodies in your serum. These antibodies indicate past or ongoing exposure to *Giardia lamblia*, suggesting your body has fought off or is still battling the parasite.

Why It’s Ordered

Your healthcare provider may recommend this test if you’ve had symptoms like stomach cramps, diarrhea, bloating, or nausea—especially after traveling to areas with poor water sanitation or if you’ve been exposed to contaminated water.

When Results May Be Positive

A positive result suggests you’ve been infected with *Giardia lamblia* at some point. This doesn’t always mean you’re currently infected, but it confirms your immune system has reacted to the parasite.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein in your arm, similar to other blood tests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG Antibody to Giardia

Frequently asked questions

Why is this test important?
This test helps confirm a diagnosis of giardiasis, a condition that can cause persistent digestive symptoms. It’s particularly useful for travelers, children in daycare settings, or anyone with recurring stomach issues that don’t improve with other treatments.
Can this test be used to treat giardiasis?
No, this test only identifies exposure to the parasite. Treatment would require prescription medications like metronidazole or tinidazole to kill the parasite and relieve symptoms.
How long does it take to get results?
Results are typically available within 3–5 business days, depending on your lab’s processing time.
  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