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Thyroid Transcription Factory (TTF1) is found is found predominantly in lung and thyroid neoplasms. The utility of TTF1 becomes apparent in the differential diagnosis of primary versus metastatic carcinomas, especially in the lung. This clone is sensitive and may show weak staining in non-lung tissues.
88342 x 1 or 88341 x 1
*The CPT codes provided with our test descriptions are based on AMA guidelines and are for informational purposes only. Correct CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed.
Last Updated: August 12, 2025