> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-editorial-guide/readme/authoring/domain-specific-modeling/body-structure/index/naming-convention-for-cells-expressing-antigens.md).

# Naming Convention for Cells Expressing Antigens

## Fully specified name

Order antigens numerically first.

* For example,
  * 732279009 |Cell positive for CD3 antigen and positive for CD4 antigen (cell)|
  * NOT
  * Cell positive for CD4 antigen and positive for CD3 antigen

Named antigens follow in alphabetical order.

* For example,
  * 1373093007 |Cell positive for CD10 antigen and positive for FMC7 antigen (cell)|
  * NOT
  * Cell positive for FMC7 antigen and positive for CD10 antigen

Include “positive”/”negative” for each antigen individually.  Do not group by positive or negative expressions.

* For example,
  * 1373277009 |Cell positive for CD4 antigen and negative for CD25 antigen and positive for CD127 antigen (cell)|
  * NOT
  * Cell positive for CD4 and CD127 antigen and negative for CD127 antigen,

## Preferred Term

The PT includes the “shorthand" expression. This terming is commonly used in the domain.

* For example,
  * 1373277009 |Cell positive for CD4 antigen and negative for CD25 antigen and positive for CD127 antigen (cell)| has a PT of “CD4+CD25-CD127+ cell”
  * 1373093007 |Cell positive for CD10 antigen and positive for FMC7 antigen (cell)| has a PT of “CD10+FMC7+ cell”

## Additional descriptions

Include an acceptable description of the FSN minus the semantic tag.

If appropriate, include an acceptable description with the expansion of a gene name, and include the word *antigen*.

* For example,
  * ![](/files/nSfa9NvZMymIv3Izu4cq)

Note:  *Not all existing content conforms to this guidance.* 

{% hint style="info" %}
See also [*Modeling* *Cells Expressing Antigens*](/snomed-ct-specifications/snomed-ct-editorial-guide/readme/authoring/domain-specific-modeling/body-structure/index-1/cell.md#modeling-of-cells-expressing-antigens)
{% endhint %}


---

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