McLean Screening Instrument for Borderline Personality Disorder
Medical screening questionnaire
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The MSI-BPD covers a broad spectrum of BPD characteristics, such as impulsivity, emotional instability, and difficulties with self-identity. Each question is answered with a "yes" or "no", indicating the presence or absence of a specific BPD symptom. A "yes" response to any item signifies the presence of that particular symptom. The total score, ranging from 0 to 10, is obtained by summing the values assigned to each answer (1 for yes, 0 for no).
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Validity
Research suggests that the MSI-BPD demonstrates good accuracy in identifying potential BPD cases. Zanarini's initial validation study in 2003 found the instrument to be both sensitive (81%) and specific (85%) in correctly classifying individuals when using a cutoff score of 7. For those 25 years old or younger, the study reported a sensitivity of 90% and a specificity of 93%. This study also found that the MSI-BPD exhibits strong internal consistency. A later study by Chanen et al. in 2008 reported lower sensitivity (68%) and specificity (75%) for those 15 to 24 years old using the same cutoff score.