K10 asks about the past 4 weeks (not the past week like PHQ-9 or past 2 weeks like GAD-7). Using the wrong time frame invalidates the K10 score. The 4-week time frame was selected by Kessler and colleagues to capture more stable distress patterns rather than transient fluctuations, making K10 better for measuring chronic distress burden than acute symptom severity.

No. K10 is a non-specific distress measure and cannot diagnose any specific mental health disorder. A high K10 score indicates elevated psychological distress requiring clinical assessment but does not identify the underlying disorder. Always follow up a K10 score of 20+ with disorder-specific assessments (PHQ-9 for depression, GAD-7 for anxiety) and a clinical interview.

K10 uses a 1-5 response scale (not 0-4). Since there are 10 items each scored minimum 1, the minimum total is 10 (not 0). This is a consistent source of confusion. K6 uses a 0-4 scale with a minimum total of 0. K10 scores should always be reported in the 10-50 range; any score below 10 indicates a scoring error.

K10 does not directly assess suicidal ideation. However, K10 score 30+ (severe distress) is associated with significantly elevated suicide risk, increased ED presentations, and higher rates of serious mental illness. Always conduct a separate suicide risk assessment in patients with K10 scores in the severe band, particularly when depressive or hopelessness items are highly scored.