Quantification of the amount of lithostathine-1-alpha measurement in a sample. The trait is lithostathine-1-alpha measurement (EFO_0801083). Also known as: islet cells regeneration factor (ICRF) levels, islet of Langerhans regenerating protein (REG) levels, pancreatic stone protein (PSP) levels, pancreatic thread protein (PTP) levels, regenerating islet-derived protein 1-alpha (REG-1-alpha) levels, regenerating protein I alpha levels.