Final answer:
The most likely measurable individual health status indicator a PHN would use is a 50-year-old woman receiving annual mammograms, as it's a specific and direct measure relevant to that age group's preventive health guidelines.
Step-by-step explanation:
A Public Health Nurse (PHN) developing a measurable outcome health status indicator for individual-level practice might use various options. Considering the choices provided, a 50-year-old woman receiving annual mammograms is the most likely measurable outcome that a nurse would use. This is because it is a specific, individual-level health service utilization measure that reflects the recommended healthcare guidelines for women aged 50 and older. Data such as these can inform healthcare professionals about adherence to preventive health practices and be used to track health outcomes over time.
Other options, such as school absences declining or increased teacher awareness, though important, are community-level outcomes and less directly measurable at the individual level. Utilization of a free mammogram program by those in poverty indicates a vital community service, but it's a population-level indicator rather than focusing on an individual's health practice.