Call us at

phone icon
+65 6386 9098

Call us at +65 6386 9098

Or Send Us an Enquiry

About Us

Atlas Pacific Medical is a clinic specialising in HIV and sexually transmitted disease/infection STD/STI testing. Our doctors have spent many years in this field and are experienced in dealing with the myriad of problems presented by HIV and STDs/STIs.

We can arrange all manner of STD/STI testing performed by experienced doctors, both male and female. We give expert advice on symptoms and signs you may be experiencing and we aim to get you back to health.

STD/STI and HIV are somewhat taboo areas that many prefer to ignore but there is no shame in being cautious with your health. In fact those that screen often will experience fewer long term problems.

So feel free to come and speak to our friendly and approachable doctors about any issues you may be having. Remember we still cover all the GP stuff as well.

Services Provided

HIV Screening

HIV screening is an important part of overall health screening. HIV often has no symptoms making it difficult to spot clinically. Testing is often the only way to know for sure. We cover a wide range of screening services, from finger prick, oral, blood and lab test, starting from an affordable rate of $45 for a simple test to more elaborate screening services.


HIV stands for Human Immunodeficiency Virus and is an infection that targets white blood cells of the body, weakening the immune system. If HIV is left untreated it progressively weakens the immune system making you more susceptible to other infections, which can be fatal. Once the immune system has weakened sufficiently, HIV then progresses to Acquired Immune Deficiency Syndrome (AIDS), which is the end stage of the disease.

Sadly not at this time. There are treatments available that suppress the virus and prevent it from progressing but there is no method of removing it completely from your system. There is a caveat to this where there has been a potential new infection within the last 72 hours as there is a medication known as the Post Exposure Prophylaxis (PEP) that can kill off the virus completely before it establishes itself in your body. But as mentioned this has to be started within a 72 hour window of the infection.

Very simple; the easiest way is through rapid testing that either involves a mouth swab or a finger-prick test. Both methods will yield results in 20 minutes and can conclusive as early as 1 month after a potential exposure. Laboratory testing is also available but this requires a full blood draw and can take several days to return a result.

Sexually Transmitted Disease/Infection (STD/STI) Screening

STDs/STIs are diseases passed on through sexual contact, be that vaginal, anal or oral sex. Symptoms can help to identify an infection but lack of symptoms is often misleading.

STDs can be screened through a collection of blood, urine and swab samples depending on location of a potential infection. Screening itself is largely pain-free and can be performed quickly. The only wait is approximately 1 week for the results to return from the laboratory.

It is important to note that not everyone experiences symptoms when they have an STD meaning that some may go undetected if they base their screening purely on symptoms. This is the reason why easily curable infections such as Chlamydia and Gonorrhoea are often missed and not treated leading to ongoing infections rates worldwide. Screening tests are the only way to know if an infection is present.


STDs are Sexually Transmitted Diseases and as the name suggests they are infections that are almost exclusive to sexual intercourse. Using barrier protection such as condoms helps reduce the risk considerably but they are not 100% safe.

Symptoms will depend on the actual STD involved but the most common STDs such as Chlamydia and Gonorrhoea can produce a burning sensation passing urine or penile discharge in men and vaginal discharge or pain during sex for women. However, it is important to note that up to 80% of people infected with an STD have no symptoms, making them an unreliable indicator. The only way to know for sure is through screening/testing.

This also depends on the site of the potential STD but as a rule of thumb most can be screened with a urine and blood test (for men) or a blood and vaginal swab (for women). Results often take up to a week to return as the infections need to be cultured and grown at the laboratory.

About Our Doctors

Dr Justin Sim


  • MBChB (UK)
  • Member of Society for Men’s Health (Singapore)
  • Certificate Men’s Health
  • Member American Academy of Aesthetic Medicine

Dr Justin prides himself on developing strong relationships with his patients, enabling the best possible holistic care. He believes that communication, integrity and compassion are key tenets of medical care.

Dr Justin grew up in the UK and continued onto medical school in Bristol. After completing medical school, he practiced in the NHS for 3 years encompassing a variety of specialties that included general medicine and general surgery. After, he moved to Singapore with his wife (Dr Sim Li Kun) and embarked on a career in Radiology. After spending 3 years in radiology, Dr Justin missed direct interaction with his patients and returned to clinical general practice and has never looked back.

Dr Justin has a wide range of interests that include sexual health, HIV testing/prevention, men’s health and aesthetics. After practicing in another GP clinic for several years he has built up a wealth of experience.

Minor aesthetics is also an area of interest and Dr Justin is experienced and accredited (by Aesthetic Dermatology Educational Group and American Academy of Aesthetic Medicine) to perform filler injections, and chemical/acid peels.

Dr Justin is an approachable and affable doctor who is happy to tend to your medical needs, no matter how big or small.

Dr Sim Li Kun


  • MBChB (UK)
  • GDFM (Singapore)
  • Member of Society for Men’s Health (Singapore)
  • Certificate Men’s Health
  • Certificate Clinical Dermatology

Dr Sim Li Kun is a down to earth and easily approachable doctor. Her friendly demeanour is only matched by her breadth of knowledge, particularly in her field of interest of women’s health. She also prides herself on good communication with her patients, which in turn develops a good relationship.

Dr Sim grew up in Malaysia but moved to the UK to study, which included her medical school training. After completing her training she worked in the NHS for 2 years covering general medical and surgical specialties. She also spent several rotations in obstetrics and gynaecology, where her specialist interest was cultivated. Dr Sim moved to Singapore with her husband (Dr Justin Sim) after that and continued on a general practice course and has been happy to serve her patients ever since.

Her time in Singapore was spread over a wide range of disciplines including General Medicine, Obstetrics and Gynaecology, Emergency Medicine, Paediatrics, and Polyclinic/private GP. This has given her a firm foundation for everything family medicine has to offer.

As mentioned, her area of expertise is women’s health but she also is well established in general sexual health and HIV testing/prevention. Her second area of interest is fertility screening, which encompasses everything from pre-marital fertility screening to screening for those finding it difficult to conceive.

Dr Sim has completed her Graduate Diploma in Family Medicine enabling her to treat a vast variety of clinical conditions.

Dr Sim strives to be a friendly and approachable doctor and is more than happy to help with any issues you may have.

We also deal with men’s health and women’s health. Areas of men’s health include low testosterone, erectile dysfunction (ED), premature ejaculation (PE), and hair loss. For women we cover contraception, abnormal vaginal discharge, fertility screening and general gynaecology checks. For more information, click here to go to our main website.

Call us at +65 6386 9098

Or Send Us an Enquiry

See You at Atlas Pacific Medical

428 River Valley Road
01-10 Loft@Nathan
Singapore 248327

Tel. No.: (+65) 6386 9098
24 Hours Hotline: (+65) 8419 1943

Opening Hours

Monday 8:30am to 7:30pm
Tuesday to Thursday: 8:30am to 1:30pm, 5pm to 7:30pm 
Friday: 8:30am to 4:30pm
Sunday: 5pm to 7:30pm 
Saturday and PH: Closed
Last registration 30 minutes before closing.