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Toxicity Screening for Giardia duodenalis (Antibody) - Immunoassay

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

This test checks for antibodies in your blood that may indicate past or current infection by Giardia duodenalis, a parasite that can cause gastrointestinal symptoms like diarrhea, stomach cramps, and nausea.

Quick summary

["Helps diagnose Giardia infection, often linked to contaminated water or poor hygiene."]

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

Key facts at a glance

LOINC
22580-5
Short code
T gondii IgG Ser Ql
Synonyms
T gondii 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 This Test Measures

Giardia duodenalis is a microscopic parasite that can infect your digestive system. If your body detects this parasite, it produces antibodies as part of its immune response. This test detects those antibodies using an immunoassay method to identify if an infection has occurred.

Why It’s Ordered

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

What to Expect

No special preparation is needed. A blood sample is taken from a vein in your arm. The test is usually done in a lab and results are available within a few days.

Common Symptoms of Giardia Infection

Symptoms may include watery or fatty diarrhea, stomach cramps, nausea, vomiting, gas, and bloating. Some people may not have symptoms at all, especially children or those with weakened immune systems.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Giardia Antibody Screen

Frequently asked questions

How long does it take to get results from this test?
Results are typically available within 2 to 5 business days, depending on your lab’s processing schedule. Your healthcare provider will discuss the results with you during your follow-up visit.
Can I drink alcohol before this test?
No alcohol consumption is recommended before this blood test, as it may affect certain lab results. However, since this test does not involve fasting, alcohol intake is not directly restricted.
What if my test results are positive for Giardia antibodies?
A positive result means your body has likely encountered Giardia in the past. Follow-up testing, such as a stool exam, may be needed to confirm active infection. Your doctor will guide you on next steps, which may include treatment or further monitoring.
  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