1p/1q 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 1p deletions by determining the ratio of the number of positive signals for chromosome arm 1p per those for chromosome arm 1q in a tissue specimen.

**Synonyms:** - 1p/1q chromosome deletion [# Ratio] in Tissue by FISH