Procollagen III Blood Test (PIIINP – Liver Fibrosis Marker)

The Procollagen III Blood Test measures the amino-terminal propeptide of type III procollagen (PIIINP), a byproduct released when the body lays down new collagen. Because collagen turnover accelerates during hepatic fibrogenesis, PIIINP serves as a sensitive serum marker of active liver scarring. This test is particularly useful for patients with chronic liver conditions such as viral hepatitis, alcohol-related liver disease, non-alcoholic fatty liver disease (NAFLD), or those taking medications that can affect the liver. It is also used to monitor disease progression and treatment response in conditions like primary biliary cholangitis and autoimmune hepatitis.

Biomarkers

Liver Fibrosis Marker
- Procollagen III (PIIINP)

Why it matters

Liver fibrosis is often silent until significant damage has occurred. By measuring PIIINP, this test offers a non-invasive way to assess ongoing collagen deposition, helping clinicians detect active fibrogenesis earlier than standard liver function tests alone. Early identification allows for timely intervention, whether that means adjusting medications, addressing underlying causes such as alcohol use or viral infection, or initiating antifibrotic strategies. For patients already under surveillance, PIIINP can provide objective evidence of whether fibrosis is stabilising or progressing, guiding more informed clinical decisions.