Used in biomedical research to measure levels of Guanosine Triphosphate Cyclohydrolase 1 (GCH1) in human samples. Helps in studying conditions related to tetrahydrobiopterin (BH4) deficiency, such as cardiovascular diseases, diabetes, chronic pain, and neurological disorders like Parkinson’s disease. Enables researchers to assess GCH1 expression in cell cultures, serum, or tissue samples, supporting investigation into oxidative stress, endothelial dysfunction, and inflammation. Commonly applied in clinical labs and pharmaceutical research for biomarker validation and drug development.