Yes, unless you have maintained a stable undetectable HIV viral load (see below), you must inform your sexual partner of the risks of getting HIV from you before having sex (when informing your partner of the risks, you cannot avoid telling your partner that you have HIV). This is to allow your partner to choose to take appropriate precautions.

It is an offence not to do so, under the Infectious Diseases Act.

You are considered to have maintained a stable undetectable HIV viral load if you satisfy the following criteria:

• You have stable consecutive undetectable HIV viral load test results (below 200 copies per millilitre of blood), for at least six months;

• Your most recent HIV viral load test shows a result of undetectable (below 200 copies per millilitre of blood), and is nine months or less before when you have sex;

• You have adhered to medical treatment for HIV infection up to the time of when you have sex; and

• All the HIV viral load test results mentioned above are from a licenced laboratory in Singapore.

If you satisfy the above criteria, you do not pose a risk of transmission of HIV to your sexual partner. Therefore, you no longer need to inform your sexual partner of the risks of getting HIV from you.