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Blood Test (Blood Work): What It Is, Why Your Doctor Ordered It, and What Your Results Can Tell You About Your Health

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

A laboratory test that identifies and grows aerobic bacteria from vaginal fluid samples to diagnose infections.

Quick summary

{"This test detects harmful bacteria in vaginal fluid using culture methods","It helps diagnose vaginal infections like bacterial vaginosis","Results guide appropriate antibiotic treatment","Sample is collected using a swab during pelvic examination","Results typically available in 2-5 days"}

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

Key facts at a glance

LOINC
11261-5
Short code
VAGAC
Synonyms
Bacteria Vag Aerobe Cult
Category
chemistry
Sample
serum
Container
Amies or Stuart's transport medium swab; sterile container for fluid specimens; or bacterial transport system (e.g., Copan ESwab, BD ESwab)
Units
N/A
Fasting
false
Population
adult
Sex
female
Age range
12–99 years
Method
aerobic-culture
CPT
87070
SNOMED
395153009
Specimen volume
1-2 mL vaginal fluid or 1-2 swabs in transport medium
Stability
Room temperature: 2 hours; Refrigerated (2-8°C): 24-48 hours in transport medium. Best processed within 24 hours of collection.
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
48–96 hours
Order
routine

A blood test is a routine laboratory procedure that analyzes a small sample of your blood to check how well your body is working, screen for certain conditions, and help your doctor make informed decisions about your ongoing care.

The Vaginal Fluid Bacterial Culture test identifies aerobic bacteria present in vaginal fluid. During the test, a sample of vaginal fluid is collected using a sterile swab and placed in a special environment that allows bacteria to grow. Laboratory technicians then identify the specific types of bacteria present and determine which antibiotics might be effective against them.

Your doctor may order this test to look for signs of infection, anemia, or other health problems, to monitor a chronic condition or a medication you take, or as part of a routine checkup to evaluate your overall health and catch issues early.

Your healthcare provider may order this test if you have symptoms of a vaginal infection, such as unusual vaginal discharge, itching, burning, or odor. The test helps distinguish between different types of vaginal infections, including bacterial vaginosis, and identifies the specific bacteria causing the problem. This information is crucial for prescribing the most effective treatment.

The sample is collected by drawing blood from a vein, usually in your arm. A trained technician will clean the site, wrap a band around your upper arm, and use a small needle to fill one or more tubes; the process usually takes only a few minutes.

During a pelvic examination, your healthcare provider will gently insert a speculum into the vagina and collect a sample of vaginal fluid using a sterile cotton swab. The sample is then placed in a sterile container and sent to the laboratory for analysis. The procedure is quick and may cause mild discomfort but is generally not painful.

Your results show whether the substances measured in your blood fall within the normal reference range. Values that are higher or lower than expected may point to a condition that needs follow-up, but only your doctor can interpret them together with your symptoms and medical history.

Results typically show which types of bacteria were identified in your sample. A 'negative' result means no significant bacterial growth was found, while a 'positive' result identifies specific bacteria. Your healthcare provider will interpret these results along with your symptoms to determine if treatment is needed. Some bacteria are normal vaginal flora, while others may indicate infection.

Reference range

Normal vaginal flora typically includes Lactobacillus species (predominant). No growth of pathogenic aerobic bacteria is considered normal. Isolated aerobic organisms reported qualitatively as: No growth, Rare, Few, Moderate, or Many.N/A

Specimen: serum

Patient should avoid douching, vaginal medications, creams, or sexual intercourse for 24-48 hours prior to specimen collection. Ideally, specimen should be collected before menses or at least 48 hours after cessation of menses.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is clinically significant for diagnosing bacterial vaginosis, vaginal infections, and pelvic inflammatory disease. It helps differentiate between bacterial, yeast, and other types of vaginal infections. The test also identifies the specific bacteria causing infection, allowing healthcare providers to select targeted antibiotic therapy. This is particularly important given increasing antibiotic resistance. Additionally, the test may detect mixed bacterial infections that require combination treatment.

Frequently asked questions

Does this test hurt?
The sample collection may cause brief discomfort or a mild scraping sensation, but it is generally not painful. If you experience pain during the procedure, inform your healthcare provider immediately.
How should I prepare for this test?
Avoid vaginal douches, tampons, or sexual intercourse for 24-48 hours before the test as these may affect results. Do not use vaginal creams or medications for at least 48 hours before collection. Schedule the test when you are not menstruating for more accurate results.
How long does it take to get results?
Bacterial culture results typically take 2-5 days. Some bacteria grow quickly while others require more time to identify. Your healthcare provider will contact you with results once they are available.
What happens if bacteria are found?
If pathogenic bacteria are identified, your healthcare provider will discuss treatment options, usually antibiotics. They may also perform additional tests to determine which antibiotics will be most effective. It is important to complete the full course of prescribed treatment.
Can I have this test while pregnant?
Yes, this test is safe during pregnancy and is often performed to screen for infections that could affect pregnancy. Pregnant women with bacterial vaginosis may be at higher risk for complications and require treatment.
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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