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Antibody Screening for *Giardia lamblia* (Giardia duodenalis) IgG

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

This test measures the presence of IgG antibodies in your blood to help detect past or ongoing infection with *Giardia lamblia*, a common intestinal parasite.

Quick summary

["Checks for past exposure to Giardia parasite through antibody detection."]

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

Key facts at a glance

LOINC
7891-5
Short code
G lamblia IgG Ser-aCnc
Synonyms
G lamblia IgG Ser-aCnc
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?

IgG antibodies are a type of immune protein your body produces in response to infection. If you’ve been exposed to *Giardia lamblia*, your immune system may have generated these antibodies over time. This test does not directly detect the parasite itself but serves as an indirect marker of exposure.

Why Might You Need This Test?

Healthcare providers may order this test if you’ve had symptoms like diarrhea, bloating, or stomach pain—common signs of giardiasis—and suspect a parasitic infection. It’s also used in screening for travelers, those with weakened immune systems, or individuals in areas with known parasite risks.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, typically drawn from your arm in a clinic or lab. The sample is sent to a lab for antibody analysis.

What the Results Mean

A positive result suggests past exposure to *Giardia lamblia*, but it doesn’t confirm an active infection. A negative result means you likely haven’t been exposed recently. Results are interpreted by your healthcare provider based on your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Giardia (Serum/Plasma)

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your healthcare provider will discuss the results with you during a follow-up visit.
Can I have this test if I’m pregnant?
Yes, this test is generally safe during pregnancy. However, always confirm with your healthcare provider before scheduling, as some labs may have specific guidelines for pregnant patients.
What if my results are positive but I don’t have symptoms?
A positive IgG result means your body has recognized *Giardia lamblia* at some point, but it doesn’t always mean you’re currently infected. If you’re concerned, your provider may recommend additional testing (e.g., stool exam) or monitor symptoms closely.
  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