Clinical Genomics Resource Incubator
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Clinical Genomics Resource Incubator, published by HL7 International / Clinical Genomics. This guide is not an authorized publication; it is the continuous build for version 0.1.0-ci-build built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/cg-incubator/ and changes regularly. See the Directory of published versions

CodeSystem: Nucleotide DNA Symbols (Experimental)

Official URL: http://hl7.org/fhir/uv/cg-incubator/CodeSystem/nucleotide-dna Version: 0.1.0-ci-build
Standards status: Informative Draft as of 2026-03-23 Maturity Level: 0 Computable Name: NucleotideDNA

Single-letter symbols for DNA residues based on IUPAC nomenclature, including unambiguous, ambiguous, and N symbols.

This Code system is referenced in the definition of the following value sets:

Last updated: 2026-03-23 00:00:00+0000

Profile: Shareable CodeSystem

This case-sensitive code system http://hl7.org/fhir/uv/cg-incubator/CodeSystem/nucleotide-dna defines the following codes:

CodeDisplayDefinition
G Guanine G
A Adenine A
T Thymine T
C Cytosine C
R Purine G or A
Y Pyrimidine T or C
M Amino A or C
K Keto G or T
S Strong interaction (3 H bonds) G or C
W Weak interaction (2 H bonds) A or T
H Not-G (H follows G in the alphabet) A or C or T
B Not-A (B follows A) G or T or C
V Not-T/Not-U (V follows U) G or C or A
D Not-C (D follows C) G or A or T
N Any nucleotide G or A or T or C

Description of the above table(s).