Affective Lability Scale (ALS)
Also known as: ALS
The ALS is a 54-item self-report measure of affective lability—rapid, unpredictable shifts in mood and anxiety states. Developed by Harvey, Greenberg, and Serper in 1989, it distinguishes normal emotional responsiveness from pathological mood instability. Affective lability is recognized as feature of bipolar disorder, borderline personality disorder, certain anxiety disorders, and represents dimensional measure of emotion dysregulation.
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When to use it
Primary use: assessment of affective instability in psychiatric evaluation, particularly screening for bipolar spectrum disorder where mood instability is cardinal feature. Identification of emotion dysregulation contributing to relationship conflict, occupational difficulties, and self-harm in patients with personality pathology (especially borderline personality disorder). Baseline and outcome measurement in mood-stabilizing medication trials and psychotherapy targeting emotion regulation. Research examining affective lability as dimensional transdiagnostic feature across mood, personality, and anxiety disorders.
Strengths & limitations
- Captures key bipolar disorder feature: affective lability is core to bipolar phenomenology; ALS specifically measures mood instability that distinguishes bipolar from depression/anxiety
- Dimensional measurement: lability is dimensional trait present across psychiatric conditions; continuous scoring more informative than categorical diagnosis
- Dual subscales: Depressive Lability and Anxious Lability distinguish mood instability from anxiety instability; both forms contribute to dysfunction
- Comprehensive item pool: 54-item full version thoroughly samples affective instability across contexts and time-frames
- Sensitive to medication effects: affective lability decreases with mood-stabilizing medications; useful for tracking treatment response
- Scale length and complexity: 54-item version requires 15–20 minutes; reverse-scoring of multiple items increases administration burden; shorter 16-item version less comprehensive
- No established clinical cutoff: dimensional measure; interpretation relies on comparison to norms rather than diagnostic threshold
- Overlap with other emotion constructs: lability overlaps with emotion dysregulation, impulsivity, and trait anxiety; difficult to distinguish from other emotion-related pathology
- Limited discriminant validity for bipolar: high ALS scores occur in borderline personality disorder, anxiety disorders, and depression as well as bipolar; not specific to bipolar
- Limited pediatric validation: most research in adults; psychometric properties in children <15 not thoroughly established
Frequently asked
What is the difference between affective lability and mood disorder?
Mood disorders involve sustained mood episodes (depression, mania, hypomania) lasting days to weeks with distinct beginning and end. Affective lability involves rapid unpredictable shifts within hours or minutes without clear episodes. A person with bipolar disorder may experience affective lability within depressive or manic episodes; conversely, someone with borderline personality disorder may show lability without episodes. Lability is continuous trait; mood disorder involves episodic state changes.
Can someone with depression have high affective lability?
Yes. Depressed individuals often show affective lability—mood fluctuating unpredictably within overall depressed state. This lability may persist after depressive episode remits in some individuals, suggesting personality trait (lability) distinct from current mood state (depression). Assessment of both is important; persistent lability after mood improvement may warrant attention to emotion regulation skills training.
What typical ALS scores are associated with bipolar disorder?
Bipolar disorder patients typically score M≈128–145 SD≈35 (full 54-item version), notably higher than depression (M≈110–120) or anxiety (M≈105–115) samples. However, substantial overlap exists; elevated ALS does not automatically indicate bipolar disorder—borderline personality disorder, certain anxiety disorders, and severe depression also produce high scores. Clinical judgment using full diagnostic criteria essential.
Is affective lability treatable?
Yes. Mood-stabilizing medications (lithium, valproate, lamotrigine, atypical antipsychotics) effectively reduce affective lability in bipolar disorder. Psychotherapy approaches (DBT, emotion regulation therapy) teach emotion regulation skills. Combination medication + psychotherapy typically most effective. Lability may not completely resolve but becomes more manageable and predictable with treatment.
Is ALS available free for clinical use?
Yes. The ALS is in the public domain and freely available for research and clinical use. It may be reproduced without copyright restriction or licensing fees. Cite Harvey et al. (1989) original publication.
Sources
- Harvey, P. D., Greenberg, B. R., & Serper, M. R. (1989). The affective lability scales: Development, reliability, and validity. Journal of Clinical Psychology, 45(6), 786–793. DOI: 10.1002/1097-4679(198909)45:5<786::aid-jclp2270450515>3.0.co;2-p ↗
How to cite this page
ScholarGate. (2026, June 3). Affective Lability Scale (ALS). ScholarGate. https://scholargate.app/en/clinical-psychology/affective-lability-scale
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