Skip to content

Microbiological screening of specimens for bacterial or fungal presence (qualitative culture)

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

This test checks for the presence of bacteria or fungi in your sample, helping identify infections that may require treatment.

Quick summary

["A simple check for possible infections in your body fluids or tissues."]

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

Key facts at a glance

LOINC
673-4
Short code
O+P Spec Micro
Synonyms
O+P Spec Micro
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
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 This Test Measures

The test involves growing and examining a small sample from your body (such as blood, urine, or other fluids) to detect any microorganisms like bacteria or fungi. If microorganisms are present, they will grow into visible colonies that can be identified under a microscope or through further testing.

How the Sample Is Collected

Your healthcare provider will take a sample from you, depending on where you might have an infection. Common samples include blood, urine, or swabs from wounds or other body areas. The sample is then sent to a lab where it is cultured to check for growth of bacteria or fungi.

When You Might Need This Test

You may need this test if you have symptoms like fever, redness, swelling, or pain that could indicate an infection. It’s also used before surgeries, during chemotherapy, or if you have a weakened immune system to prevent infections.

What to Expect Before the Test

There are usually no special preparations needed. However, if your sample is urine, you may need to follow specific instructions, such as cleaning your genital area before urinating. If you’re taking antibiotics, let your doctor know, as this can affect the results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Microbiology Screen (Qualitative)

Frequently asked questions

How long does it take to get the results?
Results can take several days to a week, depending on the lab and the type of sample. Some tests may be done quickly if there’s a high suspicion of infection, but full culture results usually require more time to grow and identify microorganisms.
What does a positive result mean?
A positive result means that your sample contained bacteria or fungi. This doesn’t always mean you’re sick right now, but it signals that you may have an infection that needs to be treated with antibiotics or other medications. Your doctor will discuss the next steps with you.
Can I take antibiotics before getting this test?
It’s best to avoid taking antibiotics before this test unless your doctor specifically instructs you to. Antibiotics can change the results by killing off some bacteria or fungi, making it harder to identify the correct type for treatment.
  1. 1
  2. 2
  3. 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.

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