Skip to content

Toxicity Screening for Giardia duodenalis (IgG Antibody) - Serum

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

This test detects antibodies in your blood that your immune system produces in response to a parasite called Giardia duodenalis, which can cause intestinal infections.

Quick summary

["Helps identify past exposure to Giardia, a common cause of stomach and intestinal issues like diarrhea and bloating."]

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

Key facts at a glance

LOINC
93858-9
Short code
T gondii IgG pnl Ser Donr
Synonyms
T gondii IgG pnl Ser Donr
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 measures IgG antibodies in your serum, which your body creates to fight Giardia. These antibodies indicate whether you’ve been exposed to the parasite at some point, even if you don’t currently have symptoms.

Why Might You Need This Test?

Your healthcare provider may recommend this test if you’ve traveled to areas with poor sanitation, have symptoms like persistent diarrhea, stomach pain, or bloating, or if you’re in contact with someone who has a Giardia infection.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein in your arm. The test is usually done in a lab and results are ready within a few days.

What to Expect After the Test

After the blood draw, you may feel slight discomfort or bruising at the site, but this usually goes away quickly. You can resume normal activities immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results suggest past exposure to Giardia, which can cause gastrointestinal symptoms. However, it does not confirm an active infection. If symptoms persist, further testing or medical evaluation may be needed to rule out other causes of gastrointestinal issues.

Short name

IgG Antibody to Giardia (Serum)

Frequently asked questions

How long does it take to get the results of this test?
Results are typically available within 3 to 5 business days, depending on your lab’s processing schedule. Your healthcare provider will contact you with the results.
Can I have this test if I’m pregnant?
Yes, this test is generally safe during pregnancy. However, always discuss any medical tests with your healthcare provider, especially if you have specific concerns or medical conditions.
What does a positive result mean?
A positive result means your body has produced IgG antibodies against Giardia, indicating past exposure. This does not necessarily mean you currently have an infection, as the body may still be fighting off the parasite or its effects.
  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