Postural orthostatic tachycardia syndrome (POTS) is a cardiovascular autonomic disorder leading to debilitating symptoms and the therapeutic alternatives are limited. Proteomics is a large-scale study of proteins that enables a systematic unbiased view on disease and health, allowing stratification on patients based on their protein background. We aimed to explore proteins that may be related with the putative etiology of POTS compared with healthy controls using a highly powerful targeted proteomic mass spectrometry technique. We aimed to explore proteins that may be related with the putative etiology of POTS compared with healthy controls using a highly powerful targeted proteomic mass spectrometry technique.