LOINC Code 40558-9: Cytokeratin 20 Ag Immune stain Ql (Tiss)
40558-9 is a LOINC code used to identify Cytokeratin 20 Ag Immune stain Ql (Tiss) in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Cytokeratin 20 Ag. It is commonly used with the system or sample type 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 20 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 20 Ag [Presence] in Tissue by Immune stain
- Cytokeratin 20 Ag
- Antigen; Antigens; Autoimmune hepatitis; CK; CK 20; CK20; IHC; Imm; Immunohistochemical stain; Immunostain; ImStn; Imun; Imune; Keratin 20; Ordinal; PATHOLOGY; Point in time; PR; QL; Qual; Qualitative; Random; Screen; St; Stains; Stn; Tissue; Tissue, unspecified
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
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.