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LOINC Code 63358-6: Smooth muscle Ab IF (CSF) [Titer]

63358-6 is a LOINC code used to identify Smooth muscle Ab IF (CSF) [Titer] 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 Smooth muscle Ab. It is commonly used with the system or sample type CSF.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Smooth muscle Ab. It is commonly used with the system or sample type CSF.

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: IF

What it does not mean

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

Key facts

  • Smooth muscle Ab [Titer] in Cerebral spinal fluid by Immunofluorescence
  • Smooth muscle Ab
  • ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; ASMA; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; Dilution factor; Dilution Factor (Titer); FA; Fluorescent antibody; Fluoresent; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Musc; Muscl; Neuro; Neurology; Point in time; Random; Serology; SM; SMA; SmQn; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Time Resolved Fluorescence; Titer; Titered; Titre; TRF; Ttr

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

Smooth muscle Ab IF (CSF) [Titer]Smooth muscle Ab [Titer] in Cerebral spinal fluid by ImmunofluorescenceSmooth muscle Ab Titr CSF IFSmooth muscle AbSEROSmooth muscle antibody, Spinal fluidTitr

Frequently asked questions

Code details

Code63358-6
SystemLOINC
Display nameSmooth muscle Ab IF (CSF) [Titer]
DescriptionSmooth muscle Ab
Short nameSmooth muscle Ab Titr CSF IF
ComponentSmooth muscle Ab
PropertyTitr
TimingPt
System (specimen)CSF
ScaleSemiQn
MethodIF
ClassSERO
Example unitstiter
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.36
Last changed2.75

Consumer names

Smooth muscle antibody, Spinal fluid

Part names

Smooth muscle AbTitrPtCSFSemiQnIFTiterPoint in time (spot)Cerebral spinal fluidImmunofluorescence (IF)

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.

LOINC Code 63358-6 | HealthAssure