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Toxicity Screening for Giardia duodenalis (Giardia lamblia) – Immunoassay

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

This test detects antibodies to the parasite *Giardia duodenalis*, which causes intestinal infections often called 'beaver fever.' It helps diagnose giardiasis, a common gastrointestinal illness.

Quick summary

["This test checks for signs of infection by Giardia, a microscopic parasite that can cause stomach cramps, diarrhea, and nausea."]

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

Key facts at a glance

LOINC
110760-6
Short code
T gondii IgA Msmt Ser
Synonyms
T gondii IgA Msmt Ser
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 Is Done

Your doctor may order this test if you have symptoms like persistent diarrhea, bloating, or stomach pain that don’t improve with usual treatments. It’s also used in travelers or those exposed to contaminated water to confirm a Giardia infection.

What to Expect Before the Test

No special preparation is needed. A blood sample will be taken from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. If you’re taking blood thinners, let your doctor know.

What the Test Results Mean

Positive results indicate the presence of Giardia antibodies, suggesting past or current infection. Negative results mean no detectable antibodies, but this doesn’t always rule out infection if symptoms persist. Follow-up testing or stool samples may be needed for confirmation.

Common Causes of False Results

False positives or negatives can occur if you’ve recently been treated for giardiasis, have a weakened immune system, or if the test was done too soon after exposure. If results are unclear, your doctor may repeat the test or use additional diagnostic methods.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Giardia test (serum/plasma)

Frequently asked questions

How long will it take to get my results?
Results are typically available within 24 to 72 hours, depending on your lab. Your doctor will contact you once they’re ready. If you have urgent symptoms, ask your provider about expedited testing options.
Can I drink alcohol before this test?
Alcohol use before the test doesn’t affect the blood draw itself, but it may influence your symptoms if you’re experiencing giardiasis. Avoid heavy alcohol use if you’re experiencing gastrointestinal issues.
Is this test covered by insurance?
Check with your insurance provider to confirm coverage, as it may depend on your diagnosis and symptoms. Your doctor’s office can also help verify if this test is medically necessary for your situation.
  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