Used in diabetes research to measure C-peptide levels in blood or serum samples. Helps assess endogenous insulin production, particularly in patients with type 1 and type 2 diabetes. Enables monitoring of beta-cell function in pancreatic studies and evaluation of insulin secretion in clinical and research settings. Useful in distinguishing between type 1 and type 2 diabetes, studying remission phases in type 1 diabetes (honeymoon phase), and investigating insulin resistance. Applied in longitudinal studies to track disease progression and response to therapeutic interventions. Suitable for high-throughput screening in laboratories focused on metabolic disorders.