Circulating Tumor DNA to Total Circulating Cell-Free DNA Ratio Measurement

**Semantic type:** Laboratory Procedure

**Definition:** The determination of the ratio of circulating tumor-derived DNA compared to total circulating cell-free DNA in a sample. The measurement may be expressed as a ratio or percentage.

**Synonyms:** - Circulating Tumor-Derived DNA to Circulating Cell-Free DNA Ratio Measurement - TFx in cfDNA - Tumor Fraction in Cell-Free DNA - ctDNA to cfDNA Ratio Measurement - ctdDNA to cfDNA Ratio Measurement