Table 4 Minimum set of CBVCT M&E indicators for HIV, STIs and viral hepatitis to be integrated into national surveillance and M&E systems
1. Number of tests | |
Definition | Number of tests performed |
Comments | The number of tests corresponds to the number of testing events for a particular infection. Tests used at CBVCT services are usually screening tests. Only rarely are confirmatory tests used. Number of tests is used as a denominator for some of the CBVCT M&E indicators listed below |
2. Number of clients tested | |
Definition | Number of clients tested |
Comments | The number of clients tested corresponds to the number of clients tested for a particular infection. Number of clients tested is used as a denominator for some of the CBVCT M&E indicators listed below |
3. Reactivity rate | |
a. Reactivity rate of tests | |
Definition | Proportion (%) of reactive screening test results among all tests performed |
Numerator | Number of screening tests with reactive result |
Denominator | Number of screening tests performed |
Calculation | (Number of screening tests with reactive result)/(Number of screening tests performed) × 100 |
b. Reactivity rate for clients | |
Definition | Proportion (%) of clients with reactive screening test result among all clients tested |
Numerator | Number of clients with reactive screening test result |
Denominator | Number of clients tested with a screening tests |
Calculation | (Number of clients with a reactive screening test result)/(Number of clients tested with a screening test) × 100 |
4. Positivity/active infection rate * | |
a. Positivity/active infection rate of tests | |
Definition | Proportion (%) of confirmed positive test results (confirmed active infections) among all screening tests performed |
Numerator | Number of confirmed positive test results (confirmed active infections) |
Denominator | Number of screening tests performed |
Calculation | [Number of confirmed positive tests results (confirmed active infections)]/(Number of screening tests performed) × 100 |
b. Positivity/active infection rate for clients | |
Definition | Proportion (%) of clients with a confirmed positive test result (confirmed active infection) among all clients tested |
Numerator | Number of clients with a confirmed positive test result (confirmed active infection) |
Denominator | Number of clients tested with a screening test |
Calculation | [Number of clients with a positive confirmed test result (confirmed active infection)]/(Number of clients tested with a screening test) × 100 |
5. Linkage to care rate | |
a. Linkage to care rate for clients with a reactive screening test result | |
Definition | Proportion (%) of clients with a reactive screening test result that have been linked to care among all clients tested |
Numerator | Number of clients with a reactive screening test result that have been linked to care |
Denominator | Number of clients with a reactive screening test result |
Calculation | (Number of clients with a reactive screening test result that have been linked to care)/(Number of clients with a reactive screening test result) × 100 |
Comments | Infection specific definitions for linkage to care from CBVCT service agreed upon in each country should be used. For example, for HIV, linkage to care can be defined as linkage to specialist HIV health care within a month after first reactive screening test for HIV at CBVCT service; or, alternative definition could be linkage to confirmatory testing for HIV within a month after first reactive screening test for HIV at CBVCT service |
b. Linkage to care for clients with a positive test result (active infection) | |
Definition | Proportion (%) of clients with a positive test result (active infection) that have been linked to care among all clients with a positive test result |
Numerator | Number of clients with a positive test result (active infection) that have been linked to care |
Denominator | Number of clients with a positive test result |
Calculation | (Number of clients with a positive test result (active infection) linked to care)/(Number of clients with a positive test result) × 100 |
Comments | Positive test result is a positive result of a confirmatory test. Infection specific definitions for linkage to care from CBVCT service agreed upon in each country should be used. For example, for HIV, linkage to care can be defined as linkage to specialist HIV health care within a month after first reactive screening test for HIV at CBVCT service |
6. Proportion of all new diagnoses with first reactive test at CBVCT | |
Definition | Proportion (%) of individuals with new diagnosis in a country with first reactive (or positive) test result at a CBVCT service |
Numerator | Number of clients with a new diagnosis with first reactive (or positive) test result at a CBVCT service |
Denominator | Number of all individuals in a country with new diagnosis |
Calculation | (Number of clients with new diagnosis with first reactive (or positive) test result at a CBVCT service)/(Number of all individuals in a country with new diagnosis) × 100 |
Comment | This indicator can be estimated in an ecological way, just knowing the total number of diagnosed people in the country and the total number of people with a reactive test in CBVCT services. Other option to estimate this indicator is collecting in the HIV reporting surveillance system if a first reactive test was obtained in a CBVCT service. In both cases this indicator should be calculated at surveillance level, knowing the number of reactive cases in CBVCT services |