What Is the Difference Between a Pap Smear and an HPV Test?
Pap smears and HPV tests are both used in cervical cancer screening, but they look for different things. A Pap smear checks for abnormal changes in cervical cells, while an HPV test looks for high-risk types of human papillomavirus (HPV) that can cause these cell changes over time.
The way the sample is collected is similar for both tests. During screening, a small sample of cells is taken from the cervix and sent to a laboratory. What differs is what the laboratory looks for in that sample.
Pap Smear: Checking for Abnormal Cervical Cell Changes
A Pap smear examines cervical cells for abnormal changes that may develop before cervical cancer. Detecting these changes through screening allows them to be assessed and followed up where necessary.
The test does not directly determine whether you have a high-risk HPV infection. Instead, it looks for changes that have already occurred in the cervical cells.
HPV Test: Checking for High-Risk HPV Types
An HPV test checks the cervical sample for high-risk HPV types associated with cervical cancer. Most HPV infections clear on their own, but a persistent infection with certain high-risk types can cause cervical cells to become abnormal over time.
This means the HPV test looks for the underlying infection that may increase the risk of future cervical cell changes, rather than looking primarily for the cell changes themselves.
Which Cervical Screening Test Is Recommended for Your Age?
In Singapore, the recommended cervical screening test and screening interval depend on your age.
For women aged 25 to 29 who have had sexual activity, a Pap smear every three years is generally recommended. HPV infections are relatively common in younger women and often clear naturally, so testing directly for HPV is not routinely recommended for this age group.
From age 30 onwards, an HPV test every five years is generally recommended. At this age, testing for high-risk HPV can help identify women who may be at greater risk of developing abnormal cervical cell changes and may require further assessment.
These recommendations apply to routine screening. The test you need and how often you should be screened may differ if you have had an abnormal result or other circumstances that require a different follow-up schedule.
When Might Your Cervical Screening Needs Be Different?
Routine screening intervals are useful as a general guide, but they may not apply in every situation. Your previous results and certain stages of life can affect when screening or follow-up is appropriate.
After an Abnormal Screening Result
An abnormal Pap or HPV test does not automatically mean that cervical cancer is present. However, you may need further assessment or an earlier repeat test instead of waiting for the usual three- or five-year screening interval.
The next step depends on what was found. Your doctor may recommend closer monitoring or further examination of the cervix based on the result.
During Pregnancy and Later in Life
Pregnancy does not always mean cervical screening has to be delayed. If you are due for screening, your doctor can advise on suitable timing.
Singapore's national cervical screening programme generally covers women aged 25 to 69 who have had sexual activity. Beyond this age, screening needs may depend on your previous results and individual history.
Your screening schedule should not always be based on age alone. If your circumstances have changed or you are unsure when your next test is due, reviewing your screening history with a doctor can help clarify the appropriate next step.
Discuss Your Cervical Screening Needs With Dr Kelly Loi
Pap smears and HPV tests play different roles in cervical screening, and which test is recommended depends partly on your age. Your previous screening results and health history can also affect when you should be screened and whether further follow-up is needed.
If you are unsure which test you need or when you were last screened, discussing your screening history with a gynaecologist can help you determine what is appropriate for you.
Health & Fertility Centre for Women provides gynaecological screening services, including cervical cancer screening. Senior Consultant Obstetrician and Gynaecologist Dr Kelly Loi has contributed to medical publications and public education on women's health and fertility. Her experience supports an individualised approach to care, helping patients understand their screening options and make informed decisions based on their health history and needs.
If you would like to check whether your cervical screening is up to date, contact us to arrange an appointment.
Frequently Asked Questions About Pap Smears and HPV Tests
The recommended test generally depends on your age. In Singapore, Pap smears are recommended for women aged 25 to 29 who have had sexual activity, while HPV testing is recommended from age 30. Your doctor may advise differently depending on your screening history and individual circumstances.
Yes. HPV vaccination can protect against important high-risk HPV types, but it does not protect against every HPV type associated with cervical cancer. Women who have been vaccinated should therefore still follow the cervical screening recommendations appropriate for their age.
Your current sexual activity alone does not determine whether you need screening. If you have had sexual activity previously, cervical screening may still be recommended according to your age and screening history. Speak with your doctor if you are unsure whether you are due for a test.
A positive HPV test means that a high-risk HPV type has been detected, but it does not mean that you have cervical cancer. Depending on the result and your screening history, your doctor may recommend further testing, closer monitoring or examination of the cervix.
These are screening tests rather than tests used on their own to diagnose cervical cancer. A Pap smear can identify abnormal cervical cells, while an HPV test detects high-risk HPV types associated with cervical cancer. An abnormal screening result may lead to further assessment to determine whether treatment or monitoring is needed.
