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Dinoflagellate Toxin Measurement (Serum/Plasma)

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

This test detects the presence of toxins produced by certain microscopic algae called dinoflagellates, which can occur in water sources and may pose health risks if ingested or exposed to skin.

Quick summary

["This test helps assess potential exposure to harmful algal toxins from contaminated water."]

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

Key facts at a glance

LOINC
10661-7
Short code
Dinoflagellate Wat Micro
Synonyms
Dinoflagellate Wat Micro
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
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 Is This Test Measuring?

Dinoflagellates are single-celled organisms that can release toxins when they multiply rapidly (a phenomenon called 'red tide'). These toxins can be harmful if ingested or absorbed through the skin. This test measures the concentration of these toxins in your blood or plasma, which may indicate exposure to contaminated water, especially in recreational or occupational settings involving water activities.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like nausea, vomiting, diarrhea, skin irritation, or respiratory issues after exposure to water suspected of containing dinoflagellate toxins. It may also be used in environmental monitoring or occupational health evaluations for individuals working near water sources.

What Does a Positive Result Mean?

A positive result suggests the presence of dinoflagellate toxins in your blood or plasma, which could indicate recent exposure. However, symptoms may not appear immediately. Further evaluation by a healthcare provider is needed to determine the best course of action, such as medical treatment or further investigation of exposure sources.

What Are Common Symptoms?

Symptoms of dinoflagellate toxin exposure can vary but may include gastrointestinal distress (e.g., vomiting, diarrhea), skin irritation, or respiratory symptoms like coughing or difficulty breathing. Not everyone exposed will experience symptoms, so this test helps monitor potential risk.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Dinoflagellate toxins can cause acute poisoning, particularly in individuals who consume contaminated water or come into contact with affected water. Early detection through this test can guide preventive or therapeutic measures, such as avoiding further exposure or seeking medical attention for symptoms. It is also critical in public health monitoring to identify and mitigate risks in water bodies.

Short name

Dinoflagellate Toxin

Frequently asked questions

How Is This Test Performed?
A blood or plasma sample is collected via a simple venipuncture. The sample is then analyzed in a laboratory using a specialized immunoassay or similar method to detect the presence of dinoflagellate toxins.
What Are Possible Results?
Results may be categorized as negative (no detectable toxins) or positive (toxin present). A positive result does not always mean immediate illness but indicates potential exposure that should be evaluated further.
How Often Should This Test Be Done?
The frequency of testing depends on your exposure risk. If you frequently interact with water sources suspected of containing dinoflagellates, your healthcare provider may recommend periodic testing to monitor for toxin presence.
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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