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Antibody to *Giardia lamblia* (IgA, IgG, IgM) - Serology Panel

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

This test checks for antibodies against *Giardia lamblia*, a common intestinal parasite that can cause diarrhea, bloating, and stomach pain. It helps diagnose infections caused by this microscopic organism.

Quick summary

["Looks for signs of *Giardia* infection through blood antibodies."]

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

Key facts at a glance

LOINC
51761-5
Short code
G lamblia IgA+IgG+IgM SerPl-Imp
Synonyms
G lamblia IgA+IgG+IgM SerPl-Imp
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 This Test Measures

The test detects three types of antibodies (IgA, IgG, and IgM) against *Giardia lamblia*. These antibodies develop in response to an infection and can indicate past or current exposure. The presence of these antibodies suggests the body’s immune system has encountered the parasite.

Why It’s Done

Your doctor may recommend this test if you have symptoms like persistent diarrhea, stomach cramps, bloating, or gas—especially if you’ve traveled to areas with poor sanitation or have had recent contact with someone who has a *Giardia* infection.

How the Test Works

Blood is drawn to detect antibodies. IgG and IgM antibodies typically appear within weeks of infection, while IgA may indicate recent or active infection. This test is qualitative (not measuring exact amounts).

What to Expect Before the Test

No special preparation is needed. Wear comfortable clothing and arrive early if you have a scheduled appointment. Avoid alcohol for 24 hours before your blood draw if instructed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Giardia Antibody Panel

Frequently asked questions

This test helps confirm a *Giardia* infection, which can cause long-term digestive issues if untreated. While antibodies indicate exposure, they don’t always mean an active infection. A stool test may be needed for confirmation in some cases.
This test is useful for diagnosing *Giardia* infections in people with symptoms like chronic diarrhea, bloating, or weight loss. It’s often used in travelers, children, or those with weakened immune systems.
Can this test tell me if I have an active *Giardia* infection right now?
No, this test only shows if your body has produced antibodies against *Giardia* in the past. For an active infection, your doctor may order a stool test or other diagnostic tools.
Do I need to fast before this blood test?
No fasting is required for this test. However, follow any specific instructions your doctor gives you, such as avoiding certain medications or foods.
  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