POSTN and systemic sclerosis: However, higher periostin serum levels were found in SSc patients with an active nailfold videocapillaroscopy and a history of digital ulcers (36.2 ± 7.9 ng/mL) when compared to other patterns without digital ulcers (30.6 ± 7.3 ng/mL) (p < 0.02).