Subdecks (2)

Cards (22)

  • validity of diagnosis refers to the accuracy of the diagnosis
  • the diagnosis should accurately reflect the symptoms that are being experienced by the patient
  • the diagnosis should have predictive validity
  • diagnosis of schiz lacks predictive validity as the outcomes vary between patients (rule of thirds)
  • patients can receive different diagnosis depending on the assessment system used as there are different diagnostic criteria in the ICD and DSM.
  • cheniaux (2009) found that schiz is more likely to be diagnosed using the ICD than the DSM
  • the differences in diagnostic criteria (between ICD and DSM) suggest that schiz is over-diagnosed using the DSM or under-diagnosed using the ICD.
    this indicates poor validity as patients aren't receiving accurate diagnosis and treatment.
  • the diagnosis of schiz is also criticised for lacking predictive validity
  • the outcomes vary greatly between patients with roughly a third of the patients having one episode, a third having an episodic pattern or remission and schizophrenic episodes and a this who have no remission
  • the symptoms experienced will vary greatly between patients with a diagnosis of schizophrenia
    • e.g. som e will display positive symptoms of schiz which is very different from those displaying negative symptoms but both receive the same diagnosis of schiz
  • differences in the diagnostic criteria given in the ICD and the DSM mean that patient can receive a different diagnosis depending on the assessment system used
  • CHENIAUX et al found that schizophrenia is much more likely to be diagnosed using the ICD than the DSM
    suggesting that either schiz is over-diagnosed with ICD or under-diagnosed with DSM, which indicates poor validity, leading to patients not receiving an accurate diagnosis and treatment