Skip to content

Toxicity Screening for Giardia duodenalis (Antibody) – Immunoassay

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

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

Quick summary

["It helps diagnose possible Giardia infection by detecting your body’s immune reaction to the parasite."]

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

Key facts at a glance

LOINC
33320-3
Short code
T gondii IgG Fld-aCnc
Synonyms
T gondii IgG Fld-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

Why This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like stomach pain, diarrhea, bloating, or unexplained weight loss, especially after traveling to areas with poor sanitation or if you’ve been exposed to contaminated water.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm in a clinic or lab. If you’re unsure about timing, ask your doctor.

What the Test Results Mean

Positive results indicate your immune system has detected Giardia antibodies, suggesting past or current infection. Negative results mean no detectable antibodies were found, but other tests (like stool samples) may still be needed for confirmation.

Common Symptoms of Giardia Infection

Symptoms may include persistent diarrhea, gas, nausea, cramps, or fatigue. 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.

Giardia is a common intestinal parasite that can cause chronic diarrhea, malnutrition, and dehydration. It’s often spread through contaminated water or food. Early diagnosis helps prevent complications and allows for prompt treatment with medications like metronidazole or tinidazole.

Short name

Giardia Antibody Screen

Frequently asked questions

What causes Giardia infection?
Giardia is typically spread through drinking untreated water contaminated with parasite cysts or by consuming food/water that’s been handled by someone infected. It can also spread person-to-person in close settings like daycares or camps.
How long does it take to get results?
Results are usually available within 2–3 business days, depending on your lab’s processing time. Your doctor will discuss the results with you during a follow-up visit.
Can I take antibiotics before the test?
No, antibiotics won’t affect this antibody test, but they may be prescribed if Giardia is confirmed. Always follow your doctor’s instructions.
  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