LOINC Code 70256-3: Nuclear IgG IA (S) [Ratio]

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 Nuclear Ab.IgG. It is commonly used with the system or sample type Ser.

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: IA

What it does not mean

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

Key facts

• Nuclear IgG Ab [Ratio] in Serum by Immunoassay
• Nuclear Ab.IgG
• This term was created for (but not limited to) Euroimmun's ANA Screen ELISA (IgG) test kit, a semi-quantitative in vitro assay of a pool of human nuclear autoantibodies (IgG) against ten different antigens, including double-stranded DNA (dsDNA), histones, ribosomal P-proteins, nRNP, Sm, SS-A, SS-B, Scl-70, Jo-1 and centromeres. Semi-quantitative results are determined by the ratio of the extinction of the calibrator (cut-off) to the extinction of control or patient samples. A ratio of 1.0 or greater is a positive result, which is associated conditions such as Sharp syndrome (MCTD), Systemic lupus erythematosus, Sjögren's syndrome, Progressive systemic sclerosis, and Poly-dermatomyositis.
• ABS; Aby; ANA; ANA IgG; ANF; Antby; Anti; Antibodies; Antibody; Antinuclear antibody; Autoantibodies; Autoantibody; EIA; ELFA; ELISA; Enzyme immunoassay; IAA; Immune globulin G; Immunoglobulin G; MEIA; NA; Nuc; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; Rto; Serology; Serum; SR; SUDS

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

Frequently asked questions