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In page Dorothy Hansine Andersen:

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Andersen was also instrumental in developing methods to diagnose CF. In 1942, she described the first method for diagnosing the disease in living patients: a laboratory test evaluated the pancreatic juices secreted into the duodenum, which is the first part of the small intestine.[5] This test allowed Babies Hospital to begin the first successful diagnoses and treatment of CF in the world.[8] Building on her first diagnostic test, Andersen theorized that newborns could be screened for the disease by measuring immunoreactive trypsinogen (an enzyme secreted by the pancreas) in the blood.[citation needed]