High Vaginal Swab (HVS) Test

 

High Vaginal Swab (HVS) Test


Definition

A High Vaginal Swab (HVS) test is a laboratory investigation in which a sterile cotton swab is used to collect a sample of vaginal discharge from the upper part of the vagina (posterior fornix). The sample is then examined under a microscope and cultured to identify microorganisms causing vaginal infections and to determine the most effective antimicrobial treatment.

Purpose of the HVS Test

The HVS test is performed to:

  • Diagnose vaginal infections.
  • Identify the microorganism causing abnormal vaginal discharge.
  • Determine whether the infection is bacterial, fungal, or parasitic.
  • Guide appropriate antibiotic or antifungal treatment through culture and sensitivity testing.
  • Monitor recurrent or persistent vaginal infections.

Indications (When is the HVS Test Recommended?)

A healthcare provider may recommend an HVS test if a woman has:

  • Abnormal vaginal discharge
  • Foul-smelling vaginal discharge
  • Vaginal itching or irritation
  • Burning sensation in the vagina
  • Pain during sexual intercourse (dyspareunia)
  • Lower abdominal or pelvic pain
  • Suspected bacterial vaginosis, candidiasis, or trichomoniasis
  • Recurrent vaginal infections
  • Persistent symptoms despite treatment

 

Principle of the Test

The test is based on collecting microorganisms present in vaginal secretions. The collected sample is examined by:

  1. Microscopy – Detects bacteria, fungi, parasites, pus cells, epithelial cells, and yeast.
  2. Culture – Allows microorganisms to grow in the laboratory for identification.
  3. Sensitivity Testing (Antibiotic Susceptibility Test) – Determines which antibiotics or antifungal drugs are most effective against the isolated organism.

 

Sample Required

  • High vaginal swab (vaginal secretion)
  • Collected using a sterile cotton swab
  • Placed in a sterile transport medium and sent immediately to the laboratory.

Procedure

  1. The patient lies in the lithotomy position.
  2. A sterile speculum is gently inserted into the vagina.
  3. A sterile swab is used to collect discharge from the upper vagina (posterior fornix).
  4. The swab is placed into a transport tube.
  5. The specimen is transported to the microbiology laboratory.
  6. Laboratory tests including microscopy, culture, and sensitivity are performed.

 

Laboratory Examination

1. Microscopy

Examines:

  • Pus cells (White Blood Cells)
  • Epithelial cells
  • Red Blood Cells (if present)
  • Bacteria
  • Yeast cells
  • Budding yeast
  • Pseudohyphae
  • Trichomonas vaginalis
  • Clue cells (suggestive of bacterial vaginosis)

2. Culture

The sample is cultured on appropriate media to isolate pathogenic microorganisms.

Common organisms isolated include:

  • Candida albicans
  • Gardnerella vaginalis
  • Escherichia coli
  • Staphylococcus aureus
  • Streptococcus agalactiae (Group B Streptococcus)
  • Klebsiella species
  • Proteus species
  • Pseudomonas aeruginosa

3. Antibiotic Sensitivity Test

If bacteria are isolated, susceptibility testing identifies the most effective antibiotics for treatment.

Diseases Diagnosed by HVS Test

  • Bacterial vaginosis (BV)
  • Vulvovaginal candidiasis (Yeast infection)
  • Trichomoniasis
  • Aerobic vaginitis
  • Mixed vaginal infections
  • Other bacterial vaginal infections

Interpretation of Results

Normal Result

  • Normal vaginal flora (predominantly Lactobacillus species)
  • No significant pathogenic organisms
  • Few white blood cells

Abnormal Result

May show:

  • Increased pus cells
  • Presence of pathogenic bacteria
  • Candida yeast cells or pseudohyphae
  • Trichomonas vaginalis
  • Clue cells
  • Heavy bacterial growth on culture

Advantages

  • Simple and minimally invasive
  • Helps identify the exact cause of infection
  • Guides appropriate treatment
  • Detects bacterial, fungal, and parasitic infections
  • Useful in recurrent vaginal infections

Limitations

  • Does not diagnose all sexually transmitted infections (STIs).
  • Results may be affected by recent antibiotic use.
  • Improper sample collection can reduce accuracy.
  • Some organisms require additional molecular tests (e.g., PCR).

Precautions Before the Test

  • Avoid antibiotics for 48–72 hours before testing (unless advised otherwise).
  • Avoid vaginal creams or medications for 24–48 hours.
  • Avoid sexual intercourse for 24 hours before the test.
  • Avoid douching before sample collection.
  • If possible, the test should not be performed during menstruation.

Summary

The High Vaginal Swab (HVS) test is an important microbiological investigation used to diagnose vaginal infections. It involves collecting a swab from the upper vagina, followed by microscopy, culture, and antibiotic sensitivity testing. The test helps identify bacterial, fungal, or parasitic pathogens and enables healthcare providers to select the most appropriate treatment. It is commonly used for women with abnormal vaginal discharge, itching, burning, or recurrent vaginal infections.

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