Thyroid, FNA Cytomorphology with Molecular Reflex
- Laboratory
- Quest Diagnostics
- Test code
- 90818
- Specimen
- Needle washings in alcohol-based preservative (e.g. CytoLyt®)
- Fasting
- Not stated
- Turnaround
- Set up: Mon-Fri (a.m.)
Laboratory assay overview
This assay provides morphologic review along with appropriate molecular testing for diagnosis of thyroid samples obtained by fine needle aspirate (FNA). Any molecular testing required will be reflexed based on cytologic findings and a comprehensive assessment issued summarizing the overall findings. Papillary thyroid cancer (PTC) is associated with BRAF V600E mutation (40-50% of cases) and RET overexpression through juxtaposition to the PTC genes by chromosome fusion (5-40% of cases). Follicular thyroid carcinomas are specifically associated with PPARG-PAX8 gene fusions in 25-50% of cases. NRAS, HRAS and KRAS mutations are more commonly associated with follicular thyroid neoplasms than PTC.
View complete laboratory reference notes
See Laboratory Report
Quest Diagnostics test directory, test code 90818