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Diphtheria Skin Culture (with Specific Identification)

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

This test checks for the presence of *Corynebacterium diphtheriae* bacteria on your skin, which can cause diphtheria—a serious infection. It helps determine if you need treatment to prevent spread or complications.

Quick summary

["A skin culture may be needed if you have symptoms of infection or exposure to diphtheria."]

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

Key facts at a glance

LOINC
14482-4
Short code
Diphtheria Skin Cult
Synonyms
Diphtheria Skin Cult
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
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

Why This Test Is Done

Your healthcare provider may order this test if you have signs of skin infection (e.g., sores, redness, swelling) or if you’ve been exposed to someone with diphtheria. It’s also used to monitor treatment effectiveness or check for recurrence.

What to Expect Before the Test

No special preparation is needed. A healthcare professional will clean a small area of your skin and apply a sample to a sterile culture plate. The sample may be taken from a sore or lesion.

How the Test Works

The sample is cultured in a controlled environment to allow bacteria to grow. Over days to weeks, the lab checks for *C. diphtheriae* and confirms its presence if detected.

What the Results Mean

A positive result means diphtheria bacteria are present and may require antibiotics. A negative result means no diphtheria bacteria were found, but other infections could still be present.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Diphtheria Skin Culture

Frequently asked questions

How long does it take to get results?
Results typically take 3–7 days or longer, depending on bacterial growth. Your provider will discuss next steps once available.
Can I take antibiotics before the test?
No, antibiotics may interfere with the test. Follow your provider’s instructions to avoid them until after the culture is complete.
Is the test painful?
Minimal discomfort is possible during sample collection, but it’s usually brief. The culture itself is painless once the sample is taken.
  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