How can I effectively screen for comorbid conditions in adults presenting with depressive symptoms?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 16 August 2025 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

To effectively screen for comorbid conditions in adults presenting with depressive symptoms, a comprehensive assessment is crucial, moving beyond a simple symptom count ,.

  • Conduct a Comprehensive Assessment: Do not rely solely on a symptom count when assessing a person who may have depression ,. Instead, take into account the severity of symptoms, previous history, duration, and course of illness, as well as the degree of functional impairment and/or disability associated with the possible depression ,.
  • Inquire About Coexisting Conditions: Discuss with the person any history of coexisting mental health or physical disorders . Specifically ask about any new symptoms of other mental health disorders, including anxiety, eating disorders, bipolar disorder, or psychosis .
  • Assess for Bipolar Disorder: Always inquire about any history of mood elevation to determine if the depression may be part of bipolar disorder .
  • Consider Chronic Physical Health Problems: Be particularly alert to possible depression in people with a past history of depression or a chronic physical health problem with associated functional impairment .
  • Utilise Validated Measures: Consider using a validated measure (for example, for symptoms, functions, and/or disability) when assessing a person with suspected depression to inform and evaluate treatment . A validated depression questionnaire, such as PHQ-9, can be used to assess for depression, symptom severity, and response to treatment .
  • Review Treatment Response: If there is no improvement in symptoms after 4 weeks of antidepressant medication or 4–6 weeks of psychological therapy, consider whether an alternative diagnosis or comorbid condition may be limiting the person's response to or engagement with treatment .
  • Refer if Necessary: If, after initial depression identification questions, the practitioner is not competent to perform a mental health assessment, refer the person to an appropriate professional who can .

Educational content only. Always verify information and use clinical judgement.