56638-0

LOINC Code


LOINC code56638-0
name
statusDEPRECATED
Replacements

alternatives to this code:

17533-1
56977-2

Fully-Specified Name

componentRheumatoid arthritis nuclear Ab
propertyTitr  =  Dilution Factor (Titer)
timePt  =  Point in time:  To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements.
systemSer  =  Serum
scaleOrd  =  Ordinal:  Ordered categorical responses, e.g., 1+, 2+, 3+; positive, negative; reactive, indeterminate, nonreactive.
methodIF  =  Immune Fluorescence:  Encompasses DFA, IFA, FA. Usually applies to cells and smears examined microscopically so that both the “where” and the “what” can be assessed, but can also be used on fluids in a way similar to ELISA. Does not include Cell binding assays (see CBA IFA above).

Additional Names

short nameABS; Aby; ACIF; ANA; ANF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Antinuclear antibody; Arth; Autoantibodies; Autoantibody; Dilution factor; Dilution Factor (Titer); FA; FANA; Fluorescent antibody; Fluoresent; IFA; Immune flu

Basic Attributes

classSERO
type1  Laboratory
order vs. observationDeprecated RA N

Member of these Groups

LG23002-5Rheumatoid arthritis nuclear Ab|Titr|Pt|ANYBldSerPl

History/Usage

first released
last updated2.36
last change typeDEL  - delete (deprecate)

Related Names

N

Copyright © 2026 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2026, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. See https://loinc.org/license for the full LOINC copyright and license.

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