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Ricin Toxin, Qualitative, Serum

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

This test looks for the presence of ricin toxin in a serum sample. It is a qualitative screen, meaning it reports whether ricin is detected or not detected rather than a precise amount.

Quick summary

["A serum ricin toxin screen helps determine whether a person has been exposed to this dangerous plant-derived toxin."]

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

Key facts at a glance

LOINC
41639-6
Short code
Ricin Tox IgM Ser Ql IF
Synonyms
Ricin Tox IgM Ser Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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

What Is Ricin?

Ricin is a highly toxic substance that occurs naturally in the seeds of the castor oil plant. It can be harmful if it is inhaled, swallowed, or injected, and it can cause serious illness. Because of this danger, detecting ricin in the body is important in suspected exposure situations.

Why This Test Is Used

The test is typically ordered when a person is suspected of being exposed to ricin, either through an accidental event or a deliberate act. It helps clinicians and public health authorities confirm whether exposure has occurred so that appropriate care and safety measures can be put in place.

How the Sample Is Collected

A blood sample is collected from a vein in the arm and processed so that the serum portion can be analyzed. In some situations, other specimens may also be collected depending on the type of suspected exposure. Collection is performed by a trained health care professional.

Understanding the Results

Because this is a qualitative screen, results are generally reported as detected or not detected. A detected result suggests that ricin was found in the sample, while a not detected result suggests it was not found at the time of testing. Results are interpreted together with the person's symptoms, exposure history, and other testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Ricin Toxin Screen

Frequently asked questions

Does a detected result mean I will definitely become seriously ill?
Not necessarily. The test shows that ricin was present in the sample, but how a person is affected depends on the route, amount, and timing of exposure. Your care team will assess your symptoms and exposure details to determine the best course of action.
How long does it take to get results?
Turnaround time depends on the laboratory performing the test and whether confirmatory testing is needed. Specialized toxin testing may take longer than routine blood tests, so ask your provider or laboratory about expected timing.
Can this test tell how much ricin I was exposed to?
This is a qualitative screen, so it reports presence or absence rather than a specific quantity. If your clinician needs more detail, additional or specialized testing may be requested.
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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