An STI test is only as meaningful as the sample you provide. Many people don't know that sexually transmitted infections colonize the area where contact occurred – and that's exactly where testing should take place.
This article explains the different types of tests available, when each is appropriate, and how to get maximum safety with the right test – whether vaginal, anal, or oral.
Sexual health · STI tests
STI testing done correctly: Which test is right for your sex life?
Why the right sample type is crucial
Whether urine, vaginal, or rectal swab – the choice of sample determines how reliable your test result will be. A test in the wrong location can miss an existing infection – even if it was performed correctly.
Test = Contact point
STIs colonize the area where sexual contact occurred. A urine test will not detect a rectal infection – and vice versa. Test where contact took place.
Often without symptoms
Many STIs are asymptomatic – especially anal infections. Without proper testing, they remain undetected and can be transmitted.
53% would be overlooked
Studies show that 53% of chlamydia and 64% of gonorrhea infections in MSM are located in non-urethral areas – and are not detected by urine testing alone.
The right sample makes the difference
A test is only as good as the sample. If contact occurred via the anus, a rectal swab is the most reliable method. With DoctorBox STI home tests, you can do just that: choose the appropriate sample type – discreetly, safely, and with scientifically sound results.
What types of samples are there?
Each sample type provides information about a specific infection location. Choose the sample based on where you had contact with the infected person.
urine sample
Suitable for: People with or without a penis for anal contact
Detection of: Chlamydia, Gonorrhea
Typical use: Standard test in cases of genital contact
Vaginal swab
Suitable for: People with a vagina
Detection of: Chlamydia, Gonorrhea, Mycoplasma genitalium, Trichomonas
Typical use: Genital examination during vaginal contact
rectal swab
Suitable for: All persons with anal contact – regardless of gender
Detection of: Chlamydia, Gonorrhea, Mycoplasma genitalium, Trichomonas
Typical use: During anal sex or anal use of sex toys
Dried blood blood sample
Suitable for: Everyone
Detection of: HIV, Syphilis, Hepatitis B/C
Typical use: Blood marker-based tests that detect systemic infections
Which sample is right for you?
Choosing the right sample depends on the type of sexual contact you had. Here's a guide:
If you are vaginally active
Recommended: Vaginal swab
Direct detection of pathogens in the vaginal mucosa. Particularly useful in cases of discharge, burning, or itching.
If you are anal active
Recommended: Rectal swab
During anal sex (giving or receiving) or anal use of sex toys, pathogens can become embedded in the rectal mucosa.
If you only had genital/oral contact
Recommended: Urine sample or vaginal swab
Usually sufficient if no anal intercourse took place. Ideal for a basic screening.
Myth vs. Fact
❌ Myth: "Only men who have sex with men need a rectal swab."
✅ Fact: Any person who has anal contact can be affected – regardless of gender or sexual orientation.
STI Complete Trio: Maximum safety with 3 samples
For a truly comprehensive screening, you need more than one type of sample. The STI Complete Trio combines all the important samples in one bundle – tailored for men and women.
STI Complete Trio | For Men
€199.00 €228.00
- Urine sample for genital area
- Rectal swab for anal area
- Dried blood blood sample for HIV, syphilis, hepatitis C
- Test for a total of 10 pathogens
- Free video consultation optional
- Discreet shipping & GDPR-protected
STI Complete Trio | For Women
€199.00 €228.00
- Vaginal swab for genital area
- Rectal swab for anal area
- Dried blood blood sample for HIV, syphilis, hepatitis C
- Test for a total of 10 pathogens
- Free video consultation optional
- Discreet shipping & GDPR-protected
What the bundle tests
- Chlamydia – the most common bacterial STI, often asymptomatic
- Gonorrhea (the clap) – can cause infertility
- Trichomonads – a parasitic infection with discharge
- Mycoplasma genitalium – a new, underestimated STI
- Mycoplasma hominis & Ureaplasma – can trigger inflammation
- HIV screening test for early detection
- Syphilis – a bacterial infection with long-term consequences
- Hepatitis C – liver inflammation caused by viruses
For whom is the STI Complete Trio particularly useful?
The three-sample screening is particularly suitable for people who want comprehensive certainty – and who want to keep a holistic eye on their sexual health.
- People who have anal sex or anal contact
- People with changing partners:
- Men who have sex with men (MSM)
- Users of sex toys (used anally or shared)
- People with symptoms in the anal or genital area
- Anyone who wants to undergo a comprehensive screening regularly
- Couples who want to create clarity together
Why three samples?
With three sample types – genital, rectal, and blood – you cover all relevant transmission routes. This gives you a complete picture of your sexual health, without any blind spots.
This is how sample collection works at home.
Taking samples is easier than you think – even the rectal swab. Everything can be done discreetly and conveniently at home.
1. Order test kit online
Choose the STI Complete Trio for men or women. The set will be delivered to your home in discreet packaging.
2. Follow the instructions
Read the enclosed instructions carefully and take the samples using the provided materials. Painless and straightforward.
3. Send a free sample
Pack the samples as described and take the prepaid envelope to the post office. Ideally, do this on the same day.
4. Retrieve the result digitally
After the laboratory analysis, you will receive your results securely in the DoctorBox app – presented in an easy-to-understand way and accessible at any time.
Practical tip
Many users report that the sampling process – including rectal swabs – is significantly easier than they expected. The instructions are clear and the materials are high quality.
Conclusion: Test where contact occurred
STIs are common – but easily treatable if detected early. Choosing the right type of sample is crucial for reliable results and protects you and your partners.
With the STI Complete Trio, you can test all relevant areas with a single order: genital, rectal, and via blood test. This gives you a complete picture – discreetly, conveniently, and scientifically sound.
💚 An STI test is not a sign of mistrust, but of responsibility. Get tested where you had contact – discreetly with DoctorBox.
Bundle for men Bundle for women
Short and sweet: The most important information at a glance
- Sample site = contact point – test where sex took place.
- Rectal swab during anal sex – useful for all genders
- Vaginal swab during vaginal contact – directly on the mucous membrane
- Urine sample taken during genital contact (penis) – the standard variant
- Blood test for HIV, syphilis, hepatitis – systemic infections
- STI Complete Trio – all 3 sample types in one bundle
- Home tests are discreet, simple & reliable – lab quality at home
Further information
- BZgA – Love life: Overview of sexually transmitted infections
- BZgA – Love life: Information on STI tests
- Robert Koch Institute (RKI): Sexually transmitted infections (STIs)
- An overview of all STI tests from DoctorBox
Source for study on extragenital STI testing: Kent CK et al., Prevalence of rectal, urethral, and pharyngeal chlamydia and gonorrhea detected in 2 clinical settings among men who have sex with men: San Francisco, California, 2003. Clinical Infectious Diseases 2005; 41(1): 67–74. DOI: 10.1086/430704
