Being undetectable refers to having a viral load that is so low it's below the detectable level in standard blood tests. This typically occurs when someone with HIV consistently takes their antiretroviral medication as prescribed, which helps control the virus effectively.

The CD4 count measures your body's immune system strength by counting specific white blood cells. Generally, for people living with HIV who are on effective treatment and have become undetectable, their CD4 counts often increase over time as their immune system strengthens due to suppressed viral replication.

It's crucial to regularly monitor both your viral load and CD4 count through medical appointments and follow-up testing recommended by healthcare professionals. By maintaining an undetectable status through proper treatment adherence, individuals can significantly reduce the risk of transmitting HIV to others while also improving overall health outcomes.