19q/19p Chromosome Deletion [Number Ratio] in Tissue by FISH

**Semantic type:** Laboratory Procedure

**Definition:** A fluorescent in situ hybridization-based procedure for estimating the number of chromosome arm 19q deletions by determining the ratio of the number of positive signals for chromosome arm 19q per those for chromosome arm 19p in a tissue specimen.

**Synonyms:** - 19q/19p chromosome deletion [# Ratio] in Tissue by FISH