Used in biopharmaceutical quality control to detect residual DNA from CHO (Chinese Hamster Ovary) cells in recombinant protein therapeutics. Ensures product safety by verifying that host cell DNA levels are within regulatory limits set by pharmacopoeias. Applied during downstream process validation to support lot release testing. Helps minimize risk of immunogenicity or genetic toxicity from contaminating DNA in final drug products. Commonly used in ELISA or qPCR-based assays for high sensitivity and specificity.