CPT® Code 88261

CPT® Code 88261 refers to a specific procedure known as chromosome analysis, which involves counting five cells and performing one karyotype analysis with banding. This procedure is typically conducted using samples obtained from peripheral blood lymphocytes, skin, or solid tissue, which must be cultured in a separately reportable procedure prior to analysis. Karyotyping is a critical evaluation method that assesses the size, shape, and number of chromosomes present in the cell samples. The banding technique utilized in this analysis is a chromosome staining method that allows for the identification of individual chromosomes by producing distinct bands. One common method of banding is Giemsa banding, which is a complex process that includes several steps: fixation of the cells using acetic acid, air drying, denaturing the chromosomes through proteolytic enzymes or alternative techniques, and finally applying Giemsa stain. Additionally, chromosome banding can also be performed using fluorochrome and Q-banding stains. This analysis is essential for identifying any extra, missing, or abnormal positions of chromosome segments. In normal human karyotypes, females typically present with 46 XX and males with 46 XY. The procedure is part of a broader range of chromosome analysis codes, including 88262, 88263, and 88264, which involve varying numbers of cells and karyotype analyses, each serving specific diagnostic purposes related to chromosomal abnormalities and conditions such as mosaicism.