Situation: A public health nurse is assigned to a coastal barangay of 3,200 residents that has never had a community assessment. The Rural Health Unit (RHU) needs baseline data for its multi-year plan. The nurse needs last year's number of children aged 6 to 59 months in the barangay who received vitamin A. Which source should she use FIRST, with the least time and cost?

Service coverage is already recorded as secondary data in the FHSIS, which the RHU compiles from the barangay's records. Secondary data save time and cost, so they are checked first. Primary data collection is reserved for information that existing records do not contain, such as beliefs and practices.

Core concept: choosing the most efficient data source

The question asks for the first source to check when the nurse needs last year’s count of children aged 6 to 59 months who received vitamin A in a barangay that has never had a community assessment. The correct answer is the Field Health Services Information System (FHSIS) reports.

The reason is straightforward: vitamin A supplementation is a routine service delivered through the RHU and its barangay health stations. When a service is delivered, it is recorded. Those records are then compiled upward into the FHSIS, which is the Philippines’ national routine health information system. Because the data already exist in compiled form, checking the FHSIS requires the least time and cost compared with generating new data through surveys or discussions.

Secondary data—information already collected and stored for another purpose—should always be checked before primary data collection is considered. The FHSIS is precisely that kind of secondary source. A house-to-house survey and a focus group discussion are primary data collection methods; they are expensive, time-consuming, and unnecessary when the information being sought is already documented.

Watch out! The Philippine Statistics Authority census data would tell the nurse how many children aged 6 to 59 months live in the barangay, but it would not tell how many of them actually received vitamin A. Coverage requires service delivery records, not population counts.

Source	Type of data	Can it answer the question?	Time and cost
FHSIS reports	Secondary, routine service data	Yes—records vitamin A doses given by age group	Lowest; already compiled at the RHU
PSA census data	Secondary, population data	No—gives the denominator, not coverage	Low, but does not answer the question
House-to-house survey	Primary	Yes, but unnecessary duplication	High; requires staff, travel, and time
Focus group discussion	Primary, qualitative	No—explores beliefs and practices, not coverage counts	High; also unsuitable for a numeric count

The FHSIS is specifically designed to capture service delivery data from health facilities, including vitamin A supplementation coverage. A study tracking FHSIS reporting in Palawan over 19 years documented that the system has been in continuous operation and that quarterly reports from health centers are the mechanism through which service statistics move upward ^[2]. This supports the practical point that the RHU already holds compiled barangay-level service data.

Primary data collection is reserved for information that existing records do not contain, such as maternal beliefs, cultural practices, or reasons for non-compliance. If the nurse later needs to understand why coverage is low, a focus group discussion or key informant interview would be appropriate. But for the baseline count of children who received vitamin A, the FHSIS is the correct first step.

The broader context reinforces this. Vitamin A supplementation for children aged 6 to 59 months is a high-priority child survival intervention, and monitoring its coverage is essential for targeting underserved populations ^[1]. Routine health information systems exist precisely so that coverage can be tracked without mounting a new survey every time a question arises. The Philippine Department of Health has invested substantial resources in data collection and reporting because service statistics are meant to be used for planning and evaluation ^[4].

Key point! In community health nursing, the sequence is always: check existing records first, then decide whether new data collection is justified. The FHSIS is the existing record for service coverage, so it is the first and most efficient source for this question.