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Giardia lamblia antibody, serum/plasma (immunoassay)

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

This test checks for antibodies to *Giardia lamblia*, a microscopic parasite that can cause intestinal infections, often leading to diarrhea, stomach cramps, or bloating.

Quick summary

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

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

Key facts at a glance

LOINC
41154-6
Short code
G lamblia IgG Ser Ql
Synonyms
G lamblia IgG Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Does This Test Measure?

The test detects IgG antibodies in your blood, which your immune system produces in response to an infection by *Giardia lamblia*. These antibodies indicate past or current exposure to the parasite.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like persistent diarrhea, stomach pain, or bloating, especially after traveling to areas with poor water quality or if you’ve been exposed to contaminated water.

When Might You Get False Results?

The test may not detect an active infection immediately, as antibodies take time to develop. If symptoms are severe or recent, your provider might recommend additional testing, such as a stool sample for parasite identification.

What Does a Positive Result Mean?

A positive result suggests you’ve been exposed to *Giardia lamblia* at some point, meaning you may have had an infection in the past or could still be infected. It does not confirm an active infection without further testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Giardia Antibody (IgG)

Frequently asked questions

Can this test be used to diagnose an active infection right now?
No, this test measures antibodies, not the parasite itself. For an active infection, your provider may recommend a stool exam or other diagnostic tests.
How long after exposure might I test positive?
Antibodies typically appear within 2–6 weeks after exposure, but results can vary. If you suspect recent exposure, discuss timing with your healthcare provider.
Does this test require fasting?
No fasting is needed for this blood test.
  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