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Vaginal Gram Stain (Qualitative) for Microbial Identification

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

This test examines a sample from your vaginal area to identify bacteria and other microorganisms, often used to assess vaginal health or infection.

Quick summary

["A Gram stain helps determine if bacteria are present and may guide treatment for infections like bacterial vaginosis."]

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

Key facts at a glance

LOINC
76705-3
Short code
T vaginalis Spec Ql Gram Stn
Synonyms
T vaginalis Spec Ql Gram Stn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
gram-stain
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

A Gram stain is a simple microscopic test that colors bacteria differently based on their cell wall composition. This helps doctors identify types of bacteria, such as Gram-positive or Gram-negative organisms, which may be causing symptoms like unusual discharge, odor, or itching.

How the Test Works

A healthcare provider collects a sample from your vagina using a sterile swab. The swab is then placed on a microscope slide, stained with crystal violet and safranin, and examined under a microscope. The staining process highlights bacterial shapes and arrangements.

Why It’s Done

This test is commonly used to diagnose conditions like bacterial vaginosis, yeast infections, or other vaginal infections. It can also help monitor chronic conditions or guide treatment decisions when other tests are inconclusive.

Preparation

No special preparation is needed for this test. You may be asked to avoid douching, sexual activity, or using vaginal medications 24 hours before the test to ensure an accurate sample.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Vaginal Gram Stain

Frequently asked questions

What Are the Possible Results?
Results are qualitative and typically reported as a description of bacterial types and counts (e.g., ‘normal flora,’ ‘abnormal bacterial overgrowth,’ or ‘yeast infection’). Your healthcare provider will interpret the results in the context of your symptoms and medical history.
How Long Does It Take to Get Results?
Results are usually available within 1 to 2 business days, as this is a microscopic examination performed in a clinical lab.
Can I Have This Test Done at Home?
No, this test requires a sample collected by a healthcare provider in a clinical setting to ensure accuracy and proper handling of the sample.
  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