Cervical Screening Test (Smear Test) – OSCE Guide

Cervical screening (previously known as a smear test) frequently appears in OSCEs and you’ll be expected to demonstrate excellent communication and practical skills. This guide provides a step-by-step approach to performing cervical screening in an OSCE setting, with an included video demonstration.

Cervical screening involves an initial test for the human papillomavirus (HPV). If HPV is detected on the cervical screening sample, cytology is performed to assess for dyskaryosis. For more information, see the Geeky Medics guide to cervical cancer and cervical intraepithelial neoplasia (CIN).

Gather equipment

Gather the appropriate equipment:

• Gloves
• Speculum
• A light source for the speculum
• Endocervical brush
• Sample pot (liquid-based cytology)
• Paper towels
• Lubricant*

*Use of lubricant should be avoided when taking a cervical smear sample due to the risk of contamination. However, if lubricant is required, only a carbomer-free product that is recommended by the manufacturer of the cervical screening kit should be used (e.g. OptiLube Zero a.k.a. CerviLube for Hologic ThinPrep).¹¹

Introduction

Wash your hands and don PPE if appropriate.

Introduce yourself to the patient including your name and role.

Confirm the patient’s name and date of birth.

Explain what the procedure will involve using patient-friendly language: “Today I need to perform a cervical screening test. This looks for the presence of a virus called HPV (human papillomavirus). If HPV is found, the lab will perform another test on the sample (cytology) to look for any abnormal cells caused by the virus. If abnormal cells are seen, you may need further investigations.

The procedure will involve me inserting a small plastic device called a speculum into the vagina. This will allow me to visualise the neck of the womb (your cervix). I will then place a very small brush into the vagina and take a sample of cells from the neck of the womb. It shouldn’t be painful, but it will feel a little uncomfortable. You can ask me to stop at any point. You may experience some light vaginal bleeding after the procedure.”

Explain the need for a chaperone: “One of the female ward staff members will be present throughout the examination, acting as a chaperone, would that be ok?”

Gain consent to proceed with the examination: “Do you understand everything I’ve said? Do you have any questions? Are you happy for me to carry out the procedure?”

Ask the patient if they have any pain or if they think they may be pregnant before proceeding with the clinical examination. Establish their last menstrual period (cervical screening is not recommended during menstruation). 

Provide the patient with the opportunity to pass urine before the examination.

Explain to the patient that they’ll need to remove their underwear and lie on the clinical examination couch, covering themselves with the sheet provided. Provide the patient with privacy to undress and check it is ok to re-enter the room before doing so.

Inspection

Position

1. Don a pair of non-sterile gloves.

2. Position the patient in the modified lithotomy position: “Bring your heels towards your bottom and then let your knees fall to the sides.”

Inspect the vulva

1. Inspect the vulva for abnormalities:

• Ulcers: typically associated with genital herpes.
• Abnormal vaginal discharge: causes include candidiasis, bacterial vaginosis, chlamydia and gonorrhoea.
• Scarring: may relate to previous surgery (e.g. episiotomy) or lichen sclerosus (destructive scarring with associated adhesions).
• Vaginal atrophy: most commonly occurs in postmenopausal women.
• White lesions: may be patchy or in a figure of eight distribution around the vulva and anus, associated with lichen sclerosus.
• Masses: causes include Bartholin’s cyst and vulval malignancy.
• Varicosities: varicose veins secondary to chronic venous disease or obstruction in the pelvis (e.g. pelvic malignancy).
• Female genital mutilation: total or partial removal of the clitoris and/or labia and/or narrowing of the vaginal introitus.

2. Inspect for evidence of vaginal prolapse (a bulge visible protruding from the vagina). Asking the patient to cough as you inspect can exacerbate the lump and help confirm the presence of prolapse.

Inserting the speculum

Warn the patient you are going to insert the speculum and ask if they’re still ok for you to do so.

If the patient consents to the continuation of the procedure, carry out the following steps.

1. If using an approved lubricant (see equipment section for details), then apply a small amount of product over the exterior sides of the speculum only, taking care to avoid the tip. This is to avoid contaminating and invalidating the sample.

2. Use your left hand (index finger and thumb) to separate the labia.

3. Gently insert the speculum sideways (blades closed, angled downwards).

4. Once inserted, rotate the speculum back 90° so that the handle is facing upwards.

5. Open the speculum blades until an optimal view of the cervix is achieved.

6. Tighten the locking nut to fix the position of the blades.

Visualising the cervix

Inspect the cervix:

• Identify the cervical os
• Inspect for erosions around the os: most commonly associated with ectropion however early cervical cancer can have similar appearances.
• Cervical masses: typically associated with cervical malignancy.
• Ulceration: most commonly associated with genital herpes.
• Abnormal discharge: several possible causes including bacterial vaginosis, vaginal candidiasis, trichomonas, chlamydia and gonorrhoea.

Cervical screening sample

1. Insert the endocervical brush through the speculum into the endocervical canal, avoiding touching the sides of the speculum with the brush.

2. Rotate the brush 5 times, 360 degrees, in a clockwise direction.

3. Remove the endocervical brush, avoiding touching the speculum as you do so.

4. Transfer the sample to the liquid-based cytology container (follow local cytology guidelines for transferring the sample from the brush into the container)

Removing the speculum

1. With your non-dominant hand, hold the blades of the speculum whilst you loosen the locking nut with your dominant hand. This ensures the blades do not snap shut when the locking nut is loosened.

2. Gently remove the speculum whilst slowly closing the blades and inspecting the walls of the vagina.

3. Cover the patient with the sheet, explain that the procedure is now complete and provide the patient with privacy so they can get dressed. Provide paper towels for the patient to clean themselves.

4. Dispose of the used equipment into a clinical waste bin.

To complete the procedure…

Thank the patient for their time.

Label the sample and complete the cytology request form.

Dispose of PPE appropriately and wash your hands.

Discuss the results process with the patient including the average wait time for results and how the results will be communicated. 

Document the procedure in the medical notes including the details of the chaperone.

Summarise your findings.

Further assessments and investigations

• Urinalysis: including β-HCG to rule out pregnancy (e.g. ectopic pregnancy).
• Vaginal swabs/endocervical swabs: if there are concerns about infection (bacterial/viral).
• Bimanual vaginal examination: to assess the uterus and adnexa for masses.
• Complete abdominal examination: if there are concerns about intraabdominal pathology (e.g. appendicitis).
• Ultrasound abdomen and pelvis: to further investigate pelvic pathology.

Reviewers

Mr Isaac Magani

Consultant Obstetrician 

Dr Ashley Jefferies

Community Sexual and Reproductive Health Registrar

References