Skip to content

Fluorescent Antibody Titration for Anticryptosporidium Antibodies (Serum)

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

This test measures your immune system’s response to *Cryptosporidium*, a microscopic parasite that can cause gastrointestinal illness. It helps diagnose infections caused by this parasite, often found in contaminated water or poor hygiene.

Quick summary

["This test checks if your body has produced antibodies against *Cryptosporidium*, which may indicate past or current infection."]

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

Key facts at a glance

LOINC
51460-4
Short code
FLUAV H16 Ab Titr Ser
Synonyms
FLUAV H16 Ab Titr Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

The test detects the presence of antibodies specific to *Cryptosporidium* in your blood. These antibodies develop after your immune system has encountered the parasite. The result helps determine whether you’ve been exposed to the parasite.

Why It’s Done

Doctors may order this test if you’ve had symptoms like diarrhea, stomach cramps, or weight loss that could be linked to a *Cryptosporidium* infection, especially after traveling to areas with poor water quality or after close contact with someone infected.

Sample Collection

A blood sample is drawn from a vein in your arm. The sample is processed to separate serum (the liquid part of blood without clotting factors) for testing.

How Results Are Interpreted

Results are reported as a **titration value** (a measure of antibody strength). A positive result suggests exposure to *Cryptosporidium*, but it does not confirm an active infection. Additional tests may be needed for diagnosis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Anticryptosporidium Antibody Test

Frequently asked questions

This test is primarily useful for identifying past exposure to *Cryptosporidium* rather than diagnosing an active infection. It may be used in outbreaks, travel-related illnesses, or in immunocompromised individuals (e.g., those with HIV/AIDS) where *Cryptosporidium* is a concern.
A positive result means your immune system has likely encountered *Cryptosporidium* at some point, but symptoms may not have occurred or may have resolved. It does not replace other diagnostic tests like stool samples for active infection.
What does a positive result mean?
A positive result indicates your body has produced antibodies against *Cryptosporidium*, suggesting past exposure. This does not mean you currently have an infection, but it may prompt further evaluation if symptoms persist or if you’re at higher risk for complications.
Can this test be used to confirm an active *Cryptosporidium* infection?
No, this test alone cannot confirm an active infection. For diagnosis of current illness, doctors may use stool tests or other clinical assessments. Antibody tests are often used alongside other methods to assess exposure history.
  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