Does this test have other names?
What is this test?
This test looks for bacteria or other organisms in a wound. The test is used to find
out if a wound is infected. It can also see the type of organism that's causing the
This test requires a small sample of cells or fluid from a wound. Then the sample
is cultured and looked at under a microscope to look for bacteria or other organisms.
An infected wound may need special treatment, such as antibiotics. The antibiotics
stop the infection and keep it from spreading to other areas of the body. Treating
the infection also helps the wound to heal.
Why do I need this test?
You may need this test if your healthcare provider suspects that your wound is infected
or if you were bitten by an animal, insect, or another person.
Symptoms of an infected wound include:
Swelling or a sudden lump under the skin
Pus or bad-smelling fluid draining from the wound
Skin around the wound that feels hot to the touch
Bumps near the wound that look like boils, pustules, spider bites, or a rash
In more serious infections, you may also have exhaustion, confusion, fever, and chills.
What other tests might I have along with this test?
Your healthcare provider may also order these tests:
Blood tests, including those to check liver function, blood proteins, and blood sugar,
as well as a complete blood count, or CBC
What do my test results mean?
Many things may affect your lab test results. These include the method each lab uses
to do the test. Even if your test results are different from the normal value, you
may not have a problem. To learn what the results mean for you, talk with your healthcare
Normal results are negative, meaning that no organisms grew in the culture from your
wound. A positive result means that bacteria or other organisms did grow and that
your wound is infected. From your test results, your healthcare provider can figure
out what's causing the infection and give you the best antibiotic to treat it.
How is this test done?
This test requires a swab of the fluid or cells from an open wound. Your healthcare
provider will carefully clean the wound and flush out any dirt with water. Then he
or she will collect a sample using a long cotton swab to gently wipe the wound. If
the wound isn't oozing, your provider may moisten the swab with a sterile saline solution.
Does this test pose any risks?
This test poses no known risks.
What might affect my test results?
Other factors aren't likely to affect your results.
How do I get ready for this test?
You don't need to prepare for this test. But be sure your healthcare provider knows
about all medicines, herbs, vitamins, and supplements you are taking. This includes
medicines that don't need a prescription and any illicit drugs you may use.