CID 646 Preclinical Small Animal Imaging Procedure

CID 646 Preclinical Small Animal Imaging Procedure (Current)
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Table CID 646. Preclinical Small Animal Imaging Procedure

Coding Scheme Designator	Code Value	Code Meaning	SNOMED-RT ID	UMLS Concept Unique ID
LN	46305-9	Whole body CT		C1830206
LN	24725-4	Head CT	P5-08067	C0202691
LN	46358-8	MRI whole body	P5-0905E	C1830259
LN	24590-2	Brain MRI		C0881827
LN	44139-4	PET whole body	R-FB9B7	C1715409
LN	44138-6	Brain PET		C0412493
LN	42175-0	Radionuclide scan of whole body	P5-D0072	C1626178
LN	24730-4	Radionuclide brain scan	P5-D9020	C0581582
DCM	127901	SPECT of whole body
LN	39632-5	Brain SPECT		C1543694
DCM	127902	SPECT CT of whole body
SCT	24135002	Ultrasonography of total body	P5-B0008	C0203309

The inconsistent pattern of modality and anatomy in the code meaning is present in the source Coding Scheme (e.g., "Whole body CT" versus "PET whole body"), and not changed, except where necessary (e.g., (42175-0, LN, "Radionuclide scan of whole body") is actually just "scan of whole body" in the source scheme, which is insufficient, so "radionuclide" has been added).
The UMLS codes that map to the SNOMED concepts, when present, are shown, in the cases when UMLS is lacking a mapping between the LOINC and SNOMED codes. E.g., (44138-6, LN, "Brain PET") maps directly to (C1715408, UMLS, "Multisection:Find:Pt:Brain:Doc:Radnuc.PET"), but (764666002, SCT, "PET Brain Study") (which does not have an SRT code) maps to (C0412493, UMLS, "PET Brain Study"), which is used instead. In general, UMLS does not unify the mappings from LOINC and SNOMED, presumably due to the lexical dissimilarity of the terms (i.e., the LOINC mapping seems to be based on the fully-specified name rather than the long common name).

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