What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 81551-4: PET+CT Bone from skull base to mid-thigh W 18F-NaF IV

Name: LOINC Code 81551-4: PET+CT Bone from skull base to mid-thigh W 18F-NaF IV
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:05.775Z

81551-4 is a LOINC code used to identify PET+CT Bone from skull base to mid-thigh W 18F-NaF IV 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 Multisection^W 18F-NaF IV. It is commonly used with the system or sample type Whole body>Skull base to mid-thigh.bone.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

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 Multisection^W 18F-NaF IV. It is commonly used with the system or sample type Whole body>Skull base to mid-thigh.bone.

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: PT+CT

What it does not mean

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

Key facts

PET+CT Bone from skull base to mid-thigh W 18F-NaF IV
Multisection^W 18F-NaF IV
bod; Bodies; BON; Bone skull to thigh; CAT scan; Computed tomography; Computerized tomography; CorePlaybook; Cranial; Cranium; CT scan; Document; Femoral; Femur; Finding; Findings; Head; Imaging; Lower extremity; PET Scan; PET+CT; Playbook; Point in time; Position Emmision Tomography; Positron Emission Tomography; Rad; Radiology; Radnuc.PET; Random; Skull to thigh; Skull.base; WB

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

PET+CT Bone from skull base to mid-thigh W 18F-NaF IVPET+CT Bone skull to thigh W 18F-NaF IVMultisection^W 18F-NaF IVRADFindPtWhole body>Skull base to mid-thigh.bone

Frequently asked questions

Code details

Code81551-4

SystemLOINC

Display namePET+CT Bone from skull base to mid-thigh W 18F-NaF IV

DescriptionMultisection^W 18F-NaF IV

Short namePET+CT Bone skull to thigh W 18F-NaF IV

ComponentMultisection^W 18F-NaF IV

PropertyFind

TimingPt

System (specimen)Whole body>Skull base to mid-thigh.bone

ScaleDoc

MethodPT+CT

ClassRAD

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.56

Last changed2.61

Part names

Multisection^W 18F-NaF IVFindPtWhole body>Skull base to mid-thigh.boneDocPT+CTWhole BodyIVW18F-NaFSkull base to mid-thigh.boneFindingPoint in time (spot)Bone from skull base to mid-thighPET+CTIntravenous

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.