Dr. Tan and Partners is one of the few approved Anonymous HIV Testing Centres in Singapore. A detailed write up on our service is available here.

Other STD services: Early STD Screening, Rapid Hepatitis B Blood Test, Swab for Gonorrhea and many more... contact us to make an appointment now!

HIV 4th Generation Test Singapore

The HIV 4th Generation Test is one of the most accurate and fastest way to determine is a person has been infected with HIV or not.

The HIV 4th Generation Test is also called the Combo test or the Duo test.

It tests for both the HIV antibodies as well as the antigens in the blood. It can be done as a rapid test i.e. you can get the results in 20 minutes.

Antibodies are produced by the body when it is infected with the HIV virus. There are many different types of antibodies. The one that is produced the earliest is called the IgM antibody. This can be produced as early as 20 days post exposure. 3rd and 4th Generation HIV tests can detect the IgM antibody.

Antigens are bits of the HIV virus shell that can be found in the blood as early as 14 days post exposure. The 4th Generation test can detect the presence of this antigen.

If the test detects either the presence of HIV antibodies or antigens, it means the patient is most likely infected with HIV. This has to be confirmed with another ELISA test. We always do at least 2 tests before diagnosing a person as HIV +ve.

Officially it is conclusive at 28 days post exposure. However, from current scientific data, we know that when the test is done at 20 days post exposure, it is already as good as 100% accurate. Personally I have tested patients +ve for HIV at only 14 days post exposure with this test.

The US CDC recommends the HIV 4th Generation test for all HIV screening. This is because it is more accurate, has a shorter window period and can pick up rare cases of sero-negative infections (see below).

The HIV 4th Generation test can detect HIV infections in very rare cases of people who are infected with HIV but never produce any anti-bodies. These are called sero-negative infections and happen in about 1 in 1 million people.

At our clinics the HIV 4th Generation test costs $150 (before GST).

You can walk in our clinics at Robertson Walk, Bencoolen Street, Novena Medical Center or Scotts Road anytime during our opening hours for this test. It only requires a finger-prick of blood and 20 minutes to get results.


We are Open on Saturdays and Sundays.

Click Here for Contact Details, Address and Opening Times.

Feel free to email your queries, feedback and suggestions on what other topics you want to see in the comments section below.


Click here for HIV Testing FAQ

More on HIV symptoms.

If you have any questions, visit our free online forum on sexual health, HIV and STDs.

Click here for Info on STD Symptoms in Men
Click here for Info on STD Symptoms in Women
Click here to see the full range of our HIV/STD Services

If you need a HIV test visit Our Clinics anytime during our opening hours. You do not need an appointment.


Find out more about Anonymous HIV testing at our clinics.

Can’t wait for 3 months to find out? Find out more about Anonymous Rapid HIV Combo test at our clinics.

If you had a high risk exposure to HIV within the past 72 hours, you can take medicines to reduce your risk of actually contracting HIV. Find out more on HIV PEP Treatment.


Related Topics:

Anonymous HIV testing at our Clinics

HIV – Understanding the Window Period

Cost of HIV/STD tests at our Clinics

Condom Broke

Getting HIV from Oral Sex

More on HIV symptoms

How long can HIV live outside the body?


We are Open on Saturdays and Sundays.

Click Here for Contact Details, Address and Opening Times.

Feel free to email your queries, feedback and suggestions on what other topics you want to see in the comments section below.


We are now Open on Weekends.

We have 5 locations conveniently located at Robertson Walk, Bencoolen Street, Novena, Scotts (Pacific Plaza) and Somerset (H&M)

Robertson Walk          6238 7810   map

Bencoolen Street        6884 4119   map

Novena                           6397 2095   map

Scotts                              6694 2348   map

Somerset                       6262 0762   map

Email: doctor@drtanandpartners.com

About Dr. Tan
Dr. Tan graduated from the National University of Singapore in 2001. His residency was in the two largest public hospitals in Singapore; Tan Tock Seng Hospital and Singapore General Hospital.

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  1. Eduardo

    Dear doctor, I had a risk more than a month ago, I had several acute symptoms confirmed by a doctor that sent me blood tests right away, at 24 days from exposure all came back negative for std’s and negative for HIV with 4th gen ELISA, my symptoms persisted so I waited til they were gone so I could test again, I tested again 37 days from the exposure with a 4th gen ECLIA, came back negative, I’m better now but my glands are slighlty swollen and I’m worried about Epstein barr and Lymphoma, do you think HIV is definitely not my problem or do I have to test again at 3 months?

    • Hi,
      Your tests should be conclusive and I would not recommend testing for HIV again. We would not be able to comment on EBV or lymphoma and you should consult a doctor to discuss your concerns further.

  2. Can hiv survive inside a bottle of water Base lube if someone put hiv+ substance into it before I used it?

    I had a cut on my tumb, when throwing away the lube some of the lube touch the cut. I am unsure if it’s actively bleeding.

    I have made plans to get a 4th gen hiv bloodbtest in 3 weeks…. but due to this should change and delay my plan for a 4th gen blood next week?

  3. Hello Doctor
    This is a great website. I had a low risk exposure (fingering with slight cut on finger) and was ill a couple of weeks after. I took the lab based Ag/Ab 4th gen test at 20 days and this was negative. The doctor said this looked good and I am very unlikely to be infected. Would you agree with this?
    Kind regards

    • I totally agree with your doctor. In fact, I do not think you were at risk to begin with. Officially, the 4th Gen HIV test is conclusive only after 28 days from the exposure.

      • Thanks for response doctor. I am still terrified about this though so will have to go for 28 day test. Thanks

  4. Alvarmor

    Hi Doctor,

    I’m a male.
    I went into a mutual masturbation with a woman on Marh 14th, 2017.
    I got the rapid oral test done after 14 days which came out negative and after that I had the Combo test done after 23 days having also a negative result.
    I have been feeling bad with some symptoms of Hiv early stages. Do you thhink I can see it as a definitive tesult and move on in my life?

    • Alvarmor

      Hi Doctor,

      Forgot to say that I had a small cut on the skin of my finger. Exactly the finger I introduced in her

      • I do not think fingering puts you at risk of HIV. Officially the HIV Combo test is conclusive at 28 days.

        • Alvarmor

          I did the test at 28 days and the result came out negative again. Doctor said I don’t need to repeat the test however I read in many websites that Combo test 4th generation is not conclusive at 28 days.
          could you please help me to know what’s the right information?

          Thanks a lot Dr!

          • It depends what test you had done. The rapid combo antigen/antibody test offered at our clinics would be considered conclusive at 28 days post exposure, but you will need to confirm with your own doctors about which test was done and whether they recommend any repeat.

  5. Hi Dr. Tan,

    I had unprotected sex with someone of an unknown hiv status. At approximately 19 days i had the EIA duo test and it was negative. At 25 days had a rapid that was negative and at 37days had a EIA duo which was negative. Should i be worried? And should i consider this conclusive?

  6. sam garg

    Hi Doctor, I got unprotected oral from Massage place. i am male. I got stdcheck.com 10 test panel at 6 weeks. all negative. HIV was 4th gen, can i move on in life. encounter was 15 jan and test was 28 feb 2017.

  7. Dear sir , I would like to do a comprehensive male std test at your clinic and a hiv p24 test . My exposure was 24th march 2017. May I know when is the best day to take the test .do all of the clinics provide this facility ? It will be best if you can share with me the peak periods so I can avoid these timings .Thank you!

    • Hi,
      Please come down to our Robertson Walk clinic at least 4-6 weeks after your exposure for full testing. All of our clinics provide testing but the Robertson Walk clinic is the only one that can run the HIV test anonymously. Usually Mondays are busiest, but otherwise the number of patients will be variable.

  8. Usguyworried

    Hello doc,

    I recieved blow job unprotected with private csw…i got hsv1 from this encounter..but on 30th day I got muscle spasm on my neck causing neck and shoulder heaviness which comes and goes with out meds.DOC said its due to muscle tension and stress
    I went through lab test all std 4th gen ab/ag on 35 day and 41 day both negative..according to my doctor I don’t need further tests..
    Do you see my neck pain as ARS?

    • Hi,
      No this is not ARS. Not least because you have tested negative already, please stop worrying.

      • Usguyworried

        Doctor thanks for reply,do i need further test for this episode..can I consider my results conclusive?

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