Diphtheria Toxin Antibody Detection (Serum or Plasma)
This test measures antibodies in your blood that your immune system produces in response to diphtheria infection or vaccination. It helps determine if you have immunity or if you may need protection.
["Checks your immune response to diphtheria, a serious bacterial infection."]
Key facts at a glance
- LOINC
- 14480-8
- Short code
- Diphtheria Spt Cult
- Synonyms
- Diphtheria Spt Cult
- Category
- chemistry
- Sample
- sputum
- Container
- Sterile sputum container
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- organism-specific-culture
- CPT
- 85610
- SNOMED
- 396252006
- Specimen volume
- 3-5 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order this test if you have symptoms of diphtheria (such as sore throat, fever, or difficulty breathing), if you’ve been exposed to the bacteria, or if you’re due for a booster shot. It can also be used to confirm vaccination effectiveness or monitor immunity in certain populations.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The process is quick and typically painless. If you’re nervous, let your provider know so they can offer reassurance or additional support.
What Happens During the Test
A healthcare professional will clean the area with an antiseptic, insert a small needle into your vein, and collect a few drops of blood. The sample is then sent to a lab for testing. The results are usually available within a few days.
What the Results Mean
High levels of antibodies suggest your immune system has recognized diphtheria or you’ve been vaccinated. Low or absent levels may indicate insufficient immunity and could prompt vaccination or booster recommendations. Always discuss results with your provider.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test plays a critical role in public health by verifying immunity against diphtheria—a disease that can cause severe complications like heart damage or nerve issues. It helps identify individuals who may need vaccination to prevent outbreaks, especially in high-risk groups like children, travelers, or those with weakened immune systems.
Short name
Diphtheria Antibody Test
Frequently asked questions
How long does it take to get results from this test?
Can I eat or drink before this blood test?
Is there any risk or discomfort with this blood draw?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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