A 40-year-old male is referred to a psychiatric clinic by his employee assistance program after significant financial difficulties came to light. He reports that over the past 2 years, he has been gambling on online sports betting platforms with increasing frequency and higher wagers. He describes needing to bet larger amounts to achieve the same level of excitement, repeated unsuccessful attempts to cut back, restlessness when not gambling, and gambling when feeling distressed. He has concealed the extent of his losses from his spouse by taking out secret loans. He has not engaged in any illegal activity. He denies substance use and has no prior psychiatric history. Which screening instrument and diagnostic threshold would be most appropriate for this clinical evaluation?