LOINC Code 74491-2: Cytokeratin 7 and Thyroid transcription factor 1 Ag Immune stain Nom (Tiss)

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Cytokeratin 7 & Thyroid transcription factor 1 Ag. It is commonly used with the system or sample type Tiss.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Order vs observation: Both
• Method: Immune stain

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Cytokeratin 7 and Thyroid transcription factor 1 Ag [Identifier] in Tissue by Immune stain
• Cytokeratin 7 & Thyroid transcription factor 1 Ag
• Double stain for thyroid transcription factor-1 (TTF-1) and cytokeratin 7 (CK7) useful in the diagnosis of neuroendocrine tumors (NETs).
• Antigen; Antigens; Autoimmune hepatitis; CK; CK 7; CK7; CK7+TTF-1; Fac; Fact; i; Identity or presence; IHC; Imm; Immunohistochemical stain; Immunostain; ImStn; Imun; Imune; Keratin 7; NK2 homeobox 1; NKX2-1; Nominal; Pathology; Point in time; Random; St; Stains; Stn; Tissue; Tissue, unspecified; TTF1; TTF-1

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Frequently asked questions