Ketorolac-d5 is primarily used in research and analytical laboratories as an internal standard in mass spectrometry and chromatography studies. Its deuterated form allows for precise quantification and detection of ketorolac in biological samples, such as blood or urine, ensuring accurate pharmacokinetic and metabolic profiling. This application is critical in drug development and clinical studies to monitor drug levels, assess efficacy, and ensure patient safety. Additionally, it aids in forensic toxicology to identify and measure ketorolac in cases of overdose or misuse. Its stability and isotopic labeling make it a reliable tool for high-precision analytical methods.