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: Giardia lamblia Cysts Qualitative Stool Test (Microscopy)

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

: This test examines a stool sample for Giardia lamblia cysts using microscopy. It helps determine whether a Giardia intestinal infection is present.

Quick summary

[": A Giardia stool microscopy test looks for parasite cysts to help diagnose a diarrheal infection."]

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

Key facts at a glance

LOINC
104404-9
Short code
Giardia lamblia cysts Stl Ql Micro
Synonyms
Giardia lamblia cysts Stl Ql Micro
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

: What This Test Is

: Giardia lamblia is a tiny parasite that can infect the intestines and cause diarrhea and stomach upset. This test uses a stool sample to look for the dormant, shell-like form of the parasite (cysts) under a microscope.

: Why It Is Ordered

: A healthcare provider may order this test when someone has ongoing diarrhea, greasy stools, stomach cramps, or other digestive symptoms that suggest a parasitic infection. It is also used when exposure to contaminated water or food is suspected.

: How the Sample Is Collected

: A small stool sample is collected in a clean container provided by the laboratory and returned as instructed. In some cases, several samples collected on different days may be requested because the parasite can be hard to find.

: What the Results Mean

: A positive result means Giardia cysts were seen in the sample, suggesting an active infection. A negative result means they were not seen, but repeat or additional testing may still be needed if symptoms continue, since the parasite can be missed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

: Clinically, detecting Giardia lamblia cysts supports the diagnosis of giardiasis, a common cause of parasite-related diarrhea that can be treated with medication. Results should always be interpreted alongside symptoms, exposure history, and any other tests ordered by the provider.

Short name

: Giardia Stool Exam

Frequently asked questions

: Do I need to avoid anything before collecting the stool sample?
: Follow the instructions from your provider or laboratory. They may ask you to avoid certain substances or medications that could interfere with the test, so check before collecting the sample.
: Can one stool sample be enough?
: Sometimes one sample is enough, but providers may request multiple samples on different days because the parasite may not be present in every sample.
: What should I do if I have symptoms but the result is negative?
: Tell your provider if symptoms continue. They may recommend repeat testing or other tests to look for additional causes of your symptoms.
  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