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Related Concept Videos

Learning Disabilities01:25

Learning Disabilities

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Learning disabilities are cognitive disorders caused by neurological impairments that affect cognitive functions like language and reading, without indicating overall intellectual or developmental challenges. These disabilities differ from global intellectual or developmental disabilities as they are limited to distinct cognitive functions. Common learning disabilities include dysgraphia, dyslexia, and dyscalculia, each of which impacts unique aspects of learning.
Dyslexia
Dyslexia is a...
753

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Related Experiment Video

Updated: Apr 14, 2026

Array Comparative Genomic Hybridization Array CGH for Detection of Genomic Copy Number Variants
09:16

Array Comparative Genomic Hybridization Array CGH for Detection of Genomic Copy Number Variants

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Cost Effectiveness of Using Array-CGH for Diagnosing Learning Disability.

G S Sagoo1, S Mohammed, G Barton

  • 1PHG Foundation, 2 Worts Causeway, Cambridge, UK, gurdeep.sagoo@phgfoundation.org.

Applied Health Economics and Health Policy
|April 21, 2015
PubMed
Summary
This summary is machine-generated.

Using microarray comparative genomic hybridisation (array-CGH) as a first-line test for diagnosing chromosomal abnormalities in UK patients is more cost-effective than using it as a second-line test. This approach saves money and achieves similar diagnostic outcomes.

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Area of Science:

  • Medical Genetics
  • Health Economics
  • Genomic Medicine

Background:

  • Undiagnosed learning disability, developmental delay, and congenital anomalies often stem from chromosomal abnormalities.
  • Microarray comparative genomic hybridisation (array-CGH) is a key diagnostic tool in clinical genetics.
  • The optimal placement of array-CGH within diagnostic pathways requires cost-effectiveness evaluation.

Purpose of the Study:

  • To compare the cost-effectiveness of using array-CGH as a first-line versus a second-line diagnostic test.
  • To evaluate the impact on diagnosing chromosomal abnormalities in patients referred to UK National Health Service (NHS) clinical genetics services.

Main Methods:

  • A cost-effectiveness analysis was performed from a UK NHS provider perspective.
  • A cohort of 1590 patients with undiagnosed learning disability/developmental delay were analyzed.
  • The study used a before-and-after design, comparing 742 patients (second-line array-CGH) with 848 patients (first-line array-CGH).
  • Costs included genetic testing and clinical appointments; outcomes were the number of diagnoses achieved.

Main Results:

  • First-line array-CGH testing was associated with a mean cost saving of GBP 241.56 per patient.
  • This strategy yielded a small increase in diagnostic yield (0.39%), equivalent to one additional diagnosis per 256 patients.
  • Sensitivity analyses confirmed that first-line array-CGH testing dominates second-line testing, being less costly and equally effective.

Conclusions:

  • Implementing array-CGH as a first-line test is more cost-effective for diagnosing chromosomal abnormalities in patients with developmental disorders.
  • This strategy offers a reduction in costs without compromising diagnostic efficacy.
  • The findings are directly applicable to UK NHS clinical genetics services, supporting a shift towards first-line array-CGH utilization.