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Toxicity Screening for Giardia lamblia (Serum/Plasma Immunoassay)

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

This test checks for antibodies in your blood that may indicate past exposure to Giardia, a common intestinal parasite.

Quick summary

["Helps diagnose potential Giardia infection through immune system response tracking."]

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

Key facts at a glance

LOINC
31685-1
Short code
T gondii IgG CSF Ql
Synonyms
T gondii IgG CSF Ql
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects specific antibodies (immunoglobulins) produced by your immune system in response to Giardia lamblia antigens. These antibodies are found in serum or plasma and indicate whether your body has encountered the parasite before, though they do not confirm an active infection.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like persistent diarrhea, stomach cramps, or bloating, especially after traveling to areas with known Giardia outbreaks. It can also be used for screening in settings like daycare centers or military recruits where parasitic infections are a concern.

What to Expect Before the Test

No special preparation is needed. You may have a blood draw at a clinic or lab, where a healthcare professional will collect a small amount of blood from your arm. The test is typically done in a few minutes.

What the Results Mean

Positive results suggest your immune system has likely encountered Giardia in the past, but they do not confirm an active infection. If symptoms persist or you suspect an ongoing infection, further testing (such as stool samples) may be needed to diagnose Giardia directly.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Giardia Antibody Screen

Frequently asked questions

Will this test show if I have an active Giardia infection right now?
No, this test only detects antibodies from past exposure. For an active infection, your doctor may recommend additional stool tests or other diagnostic methods.
Can I eat or drink before the blood draw?
You can eat and drink normally before the blood draw, as no special preparation is required.
What if my results are positive but I don’t feel sick?
A positive result means your body has likely encountered Giardia before, but you may not have symptoms. If you’re concerned, discuss further testing or follow-up with your healthcare provider, especially if you’ve traveled to areas with known Giardia risks.
  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