Data definitions

Data for HIV Lens are obtained through publicly accessible UK Health Security Agency data.

HIV Lens data methods

HIV Lens allows users to search surveillance data by ethnicity, age, exposure group and geographic region, where available.

New HIV diagnoses

The data show all new HIV diagnoses.

Late diagnoses

The number and proportion of HIV diagnoses made at a late stage of infection.

Living with diagnosed HIV

The number of people living with diagnosed HIV per 1,000 people aged 15-59 years.

HIV treatment coverage

The proportion of people with diagnosed HIV receiving HIV treatment.

Treatment started within 91 days

The proportion of people who started treatment within 91 days of HIV diagnosis.

Viral suppression

The proportion and number of people who are virally suppressed.

Needs of people living with HIV

Data from the Positive Voices survey on the 'need' and 'unmet need' for services of people living with HIV.

Indicator Definition

New HIV diagnoses

The data measure all new HIV diagnoses. People can live with undiagnosed HIV infection for many years. This means that new HIV diagnoses are not necessarily infections that have been recently acquired.

Breakdown: age, exposure, ethnicity (where available), and geographic region of diagnosis.

The data for local authorities are for adults only (15+ years).

Late diagnoses

Adults (aged 15 years and over) only. The data measure the percentage and number of HIV diagnoses that are made with CD4 counts <350 cells within 91 days of diagnosis, which is indicative of a late stage of infection.

A person diagnosed late has been living with an undiagnosed HIV infection for around three to five years and is more susceptible to infections compared to a person with a higher CD4 count. People diagnosed late have a tenfold risk of death compared to those diagnosed promptly.

This measure may contain a proportion of people (between 5 and 20%) who acquired HIV shortly before diagnosis. These individuals may have CD4 counts temporarily <350 cells.

Breakdown: exposure (where available), and geographic region of diagnosis.

Data are presented for three years combined.

Living with diagnosed HIV

The rate of people living with a diagnosed HIV infection per 1,000 people aged 15-59 years.

Rates are categorised as follows:

  • Extremely high >5 per 1,000
  • High 2-5 per 1,000
  • Lower <2 per 1,000.

In areas with high and extremely high HIV prevalence, HIV testing services should be expanded outside of sexual health settings in accordance with NICE and BHIVA testing guidelines.

Breakdown: geographic region.

HIV treatment coverage

The number of people taking antiretroviral treatment at their last clinic attendance divided by everybody in HIV care.

Breakdown: age, exposure, ethnicity (where available), and geographic region.

Treatment started within 91 days

These data reflect how quickly people newly diagnosed with HIV receive treatment.

Breakdown: geographic region (where available).

Viral suppression

A viral load under 200 copies/ml. A person who has suppressed virus at this level is unable to pass on HIV infection to sexual partners.

Breakdown: geographic region.

Needs of people living with HIV

The needs of people living with HIV are diverse and the extent to which these needs are assessed, planned for, and met directly impact on the overall health and wellbeing of the patient.

In 2017, the Positive Voices survey asked whether people had used specific services (29 in total) in the previous 12 months, and whether or not they had received that service.

The proportion of ‘need’ was defined as the percentage of people with HIV who stated their need for a service, out of all those who responded to the question. The proportion of ‘unmet need’ was defined as the percentage of people with HIV who did not receive it, out of those who stated they needed the service.

These data have been provided by Positive Voices. This is the most recent data available.

Breakdown: geographic region (where available).