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A skin or wound culture is a test to find germs (such as bacteria or a
fungus) that can cause an infection. A sample of skin, tissue, or fluid is added to a substance that promotes the growth of germs. If no germs grow, the
culture is negative. If germs that can cause
an infection grow, the culture is positive. The type of
germ may be identified with a microscope or chemical tests. Sometimes other tests are done to find the right medicine for treating the infection. This is called sensitivity testing.
Most bacteria can grow in oxygen. They are called aerobic bacteria and
usually are found in wounds close to the skin surface (superficial). Bacteria
that cannot grow in the presence of oxygen (anaerobic) usually are found in
deeper wounds and
abscesses. A wound culture can find out whether
bacteria are aerobic or anaerobic.
A fungal culture is done to
find out if an infection is caused by a fungus. A
viral culture can be done to find out whether an
infection is caused by a virus.
Some types of bacteria that
normally live on or in the body can cause an infection if they go to parts of
the body where they are not normally found. For example, E. coli bacteria are normally found in the colon and anus. But if
E. coli bacteria spread from the
anus to the
urethra, the bacteria may cause a
urinary tract infection (UTI).
Culture samples may
also be collected from the ear or eye, from open or closed sores, or from nails
A skin or wound culture is done
You do not need to do anything before
you have this test. If you are taking or have recently taken
antibiotics, tell your doctor.
your doctor about any concerns you have regarding the need for the test, its
risks, how it will be done, or what the results will mean. To help you
understand the importance of this test, fill out the
medical test information form(What is a PDF document?).
To collect a tissue or fluid sample from
a wound, a sterile swab is inserted into the wound. The health professional
collecting the sample may press around the wound and gently turn the swab to
collect as much tissue or fluid as possible. The swab is then placed into
either an aerobic or anaerobic culture tube or both, depending on the type of
A needle may be used to collect fluid from a
wound that is covered (scabbed-over) or from an abscess. The fluid is then
placed in the culture tube.
Your doctor may need to remove a
sample of skin or tissue (biopsy) for testing. If collecting the
sample is likely to cause pain, you may be given a shot to numb the area (local anesthetic) first.
Once a sample is
collected, it is placed in a container with a substance (called growth medium
or culture medium) that helps bacteria, fungus, or viruses grow.
bacteria, fungi, or viruses that grow will be identified with a microscope, chemical
tests, or both. If sensitivity testing is done to help make decisions about
treatment, more time will be needed.
If you have a sample of fluid or tissue
collected from a wound, you may feel some pain when the sample is collected.
You may feel a short, sharp sting if you are given a shot of anesthetic to numb
the area where the culture sample will be taken.
There is a very slight risk of spreading some
infections if a biopsy is needed to collect the sample.
A skin or wound culture is a test to find
and identify germs (such as bacteria, a
fungus, or a virus) that may be growing on the skin or
in a wound.
Some types of bacteria, fungi, and viruses grow
quickly in culture, and some grow slowly. Test results may take from one day to
several weeks, depending on the type of infection suspected.
No large numbers of harmful germs are found
on the skin or in the wound. Normal culture results are negative.
Harmful germs are found on the skin or in
the wound. Abnormal culture results are positive.
If test results are positive,
sensitivity testing may be done help make decisions
Reasons you may not be able to
have the test or why the results may not be helpful include:
Other Works Consulted
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis: Saunders.
Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.
Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby Elsevier.
ByHealthwise StaffPrimary Medical ReviewerE. Gregory Thompson, MD - Internal MedicineSpecialist Medical ReviewerW. David Colby IV, MSc, MD, FRCPC - Infectious Disease
Current as ofMay 22, 2015
Current as of:
May 22, 2015
E. Gregory Thompson, MD - Internal Medicine & W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
How this information was developed to help you make better health decisions.
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