“Global Developmental Delay DSM-5 315.8 (F88).” Theravive Counseling, https://www.theravive.com/therapedia/global-developmental-delay-dsm%C2%AD--5-315.8-(f88). 

University of Texas at Austin

There are multiple tests used to diagnose this disorder. These include:
- Genetic tests that are conducted through urine or blood samples to detect hereditary contributions
- Chromosome testing - this is another method to catch genetic defects contributing to this disorder
- Lead tests can also be conducted to find out if lead is present in the patient's environment
- Hormonal screening to check the thyroid hormone (low levels of this hormone can lead irregular growth)
- neuroimaging tests (CT and MRI scans) to check for any injuries to the central nervous system and the brain

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