Introduction The World Health Organization estimates that annual deaths due to suicide have reached nearly 800,000 globally. Data suggests that per attempt, older adults are far more likely to complete suicide compared to younger adults. Risk factors for suicide such as prior suicide attempts, physical and psychiatric illness, stressful or traumatic life events, and social isolation have been identified in older adults. However, there is sparse research which examines the unique biopsychosocial challenges faced by older adults and how these might interact with established risk factors to lead to higher lethality of suicidal behavior. Several prior studies of community-dwelling older adults have identified the Interpersonal Theory of Suicide (IPTS) as a plausible framework for this phenomenon. The IPTS posits that the pathway which bridges the gap between suicidal ideation (SI) and lethal suicidal behavior originates from two constructs which precipitate a desire for suicide - thwarted belongingness (TB) and perceived burdensomeness (PB) - combined with the capability for suicide. For older adults who are also diagnosed with personality disorders (PDs) or PD traits, which are well-known to negatively impact psychosocial functioning, this further adds to a “perfect storm” of risk factors likely to lead to completed suicide. This study aims to explore the relationship between these factors and severity of suicidality in an older adult sample on an inpatient psychiatric unit. Methods This cross-sectional study recruited all participants from the inpatient Older Adult Unit at McLean Hospital. For all participants, a chart review was conducted to obtain information regarding medical comorbidities, cognitive status, trauma history, and responses to a suicide risk assessment upon admission. Subjects also completed the Interpersonal Needs Questionnaire (INQ), Personality Inventory-DSM 5 (PID-5), PROMIS Social Isolation, World Health Organization Disability Assessment Schedule-12 Item, and Personality Assessment Inventory-Sterssors and Nonsupport Subscale at one timepoint. Primary endpoints were suicidality severity and INQ total score. Results Data collection is ongoing for this study. Data analysis will occur prior to poster presentation and results will be presented. Conclusions Data collection is ongoing. Results from this study may help identify unique risk factors contributing to suicidality in older adults and pertinent targets for intervention. This research was funded by: No funding.