You find a diagnosis that fits. You stop reading the PDF's differential list. Before ordering any test, force yourself to read the "Three Most Likely" and the "Three Most Dangerous" diagnoses from the PDF.
A PDF is a tool, not a cure for cognitive error. Watch for these traps: problemoriented medical diagnosis pdf
(Please imagine a downloadable PDF with the above content and proper headings, paragraph spacing, etc) You find a diagnosis that fits