The numerator is calculated by summing of the number of facilities reporting availability of paediatric ART services. Information on the availability of specific services is usually kept at the national or sub-national level. National AIDS Programmes should have a record of all health facilities offering ART services. A health facility census or survey can also provide this information, along with more in-depth information on available services, provided the information is collected from a representative sample of health facilities in the country. Responses to a series of questions establish whether providers in that facility provide paediatric ART services directly or refer patients to other health facilities for these services. In addition, facility records documenting the current status of service provision should be consulted. One potential limitation to facility surveys or censuses is that they are usually only conducted once every few years. Countries should regularly update their programme records on health facilities offering paediatric ART services, and supplement these data with those obtained through a health facility survey or census every few years. For health facility surveys or censuses, tools such as the Service Provision Assessment (SPA) or the Service Availability Mapping (SAM) can be used. A denominator is not requested in the UA reporting tool but some countries trying to expand paediatric ART nationally can consider Total number of health facilities, excluding specialized facilities where paediatric ART services are/will never be relevant, which can be calculated by summing the total number of health facilities included in the sample. Information for construction of the denominator may come from programme records, facility listings, and/or national strategy or planning documents. It should exclude specialized facilities where paediatric ART services are/will never be relevant. (e.g. facilities specializing in eye care where ART will never be introduced) Data Quality Control and Notes for the Reporting Tool: Please comment on whether the data reported is from a national facility listing or census, or from a survey. If a survey, please remember to report the year of the survey. If data from the private or other sectors is missing, please comment. If it is possible to easily report any additional information on the geographical distribution of facilities offering paediatric ART (e.g. urban/rural, %facilities with ART in areas with a high concentration of PLWA), please provide extra details.