bariatric surgery within 3 years after initial evaluation. They produced statistically and meaningfully higher scores on MMPI2-RF substantive scales across a number of hypothesized scales (e. g., Antisocial Behaviors, Family Problems, Anxiety)when compared to patients who proceeded with surgery (Cohen’s ds: range .20 .50). Logistic regression analyses indicated that 15% of the variance (R 1⁄4 .15) in not preceding with surgery were accounted for by a current substance use disorder diagnosis, history of psychiatric inpatient hospitalizations, lack of current psychotropic medication use, and a lower BMI. MMPI-2-RF substantive scales (controlling for inter-correlations between scales) were entered by scale set in the second block of the equation. MMPI-2-RF scores incrementally predicted a greater likelihood of failure to follow through with surgery (change in R 1⁄4 .02-.06.) after controlling for information gathered from their medical charts such as psychological diagnoses and history of psychiatric inpatient hospitalizations. MMPI-2-RF scales that assess constructs associated with demoralization, neuroticism, cognitive complaints, familial discord, disaffiliativeness, disinhibition, and substance use were useful in predicting patients who fail to follow through with bariatric surgery beyond information obtained from the psychological clinical interview and past medical chart information. Discussion: Consistent with the literature, bariatric surgery candidates cleared for surgery, but who do not follow through with surgery, report more psychopathology on the MMPI-2-RF and during the psychodiagnostic interview relative to patients who proceed with surgery. Previous literature suggests that a majority of patients who do not proceed for surgery may do so because they are unwilling to complete psychological treatment prior to surgery. Our findings highlight the importance of educating bariatric surgery candidates who show signs of psychopathology on the MMPI-2-RF on the rationale of treatment and impact on surgical outcomes. Evidence of incremental validity of psychological testing indicated that using objective assessment instruments that are broadband can be useful. For example, psychological testing suggested that factors such as neuroticism, behavioral noncompliance, and spousal solicitation are additional predictors of not following through with surgery in addition to psychological disorders and patients medical history. Moreover, psychological testing can provide a dimensional framework for assessing the severity of these factors. Future research may be helpful in early identification of those who will not successfully achieve surgery.