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Biomarkers · Chemical

Rheumatoid Factor IgA

Also listed as
Rheumatoid Factor (IgA), RF, IgA by EIA, RDL
Primary unit
U
LOINC codes
33313-8
Tests that measure Rheumatoid Factor IgA
Quest Diagnostics 4, Labcorp 2

Ranges

Each lab publishes a reference range for the population groups it tests, usually the middle 95% of results. These intervals describe that population, not an optimal or healthy target. How ranges differ

Quest Diagnostics, Rheumatoid Factor (IgA) 15682

PopulationInterval
≤6 UNegative
>6 UPositive

Quest Diagnostics test catalog, 15682

Quest Diagnostics, Rheumatoid Factor (IgA, IgG, IgM) 19705

PopulationInterval
Rhematoid Factor (IgA)Rhematoid Factor (IgA)
≤6 Negative≤6 Negative
>6 Positive>6 Positive
Rhematoid Factor (IgG)Rhematoid Factor (IgG)
≤6 Negative≤6 Negative
>6 Positive>6 Positive
Rhematoid Factor (IgM)Rhematoid Factor (IgM)
≤6 Negative≤6 Negative
>6 Positive>6 Positive

Quest Diagnostics test catalog, 19705

Tests

Check the catalog code, specimen, method and preparation for every test that measures Rheumatoid Factor IgA. Select up to five tests to compare them side by side.

Quest Diagnostics 4 tests

Single-analyte tests

  • Rheumatoid Factor (IgA, IgG, IgM) 19705

    Serum · Fasting not stated

    Method and collection
    Method
    Immunoassay (IA)
    Preparation
    Overnight fasting is preferred
    Quest Diagnostics catalog page

  • Rheumatoid Factor (IgA) 15682

    Serum · Fasting not stated · Turnaround Set up: Tues-Fri

    Method and collection
    Method
    Immunoassay (IA)
    Preparation
    Overnight fasting is preferred
    Quest Diagnostics catalog page

Panels that include this biomarker

  • Rheumatoid Arthritis Diagnostic Panel 3 19878

    6 analytes · Serum · Fasting not stated

    Method and collection
    Method
    Immunoassay (IA)
    Preparation
    Overnight fasting is preferred
    Reference notes
    Rheumatoid Factor (IgA) ≤6 Negative >6 Positive Rheumatoid Factor (IgG) ≤6 Negative >6 Positive Rheumatoid Factor (IgM) ≤6 Negative >6 Positive CCP Antibody (IgG) <20 Negative 20-39 Weak positive 40-59 Moderate Positive >59 Strong positive Sjogren's Antibody (SS-A) <1.0 Negative Sjogren's Antibody (SS-B) <1.0 Negative
    Quest Diagnostics catalog page

  • ANAlyzeR™ ANA, IFA with Reflex Titer/Pattern, Systemic Autoimmune Panel 1 36378

    19 analytes · Serum · Fasting not stated

    Method and collection
    Method
    See individual tests
    Preparation
    Overnight fasting is preferred
    Collection
    Draw three, full, 8.5 mL serum separator tubes. Allow the blood to clot for at least 30 minutes, but not longer than 1 hour before centrifugation. Centrifuge each tube for 15 minutes at 1250 to 1600 RCF. If drawn in red-top (no gel) tubes, transfer serum to transport tube(s). Place sample(s) on cold packs or in refrigerator. Sample is stable 4 days at 2-8° C (refrigerated).
    Reference notes
    See Laboratory Report
    Quest Diagnostics catalog page

Labcorp 2 tests

Single-analyte tests

  • Rheumatoid Factor, IgA by EIA (RDL) 520101

    Serum · Fasting not stated · Turnaround 5 - 7 days

    Method and collection
    Method
    Enzyme-linked immunosorbent assay (ELISA)
    Collection
    Separate serum from cells within one hour. Transfer to a plastic transport tube before freezing.
    Labcorp catalog page

Panels that include this biomarker

  • Rheumatoid Factor Isotypes, IgG, IgA, and IgM by EIA (RDL) 520178

    3 analytes · Serum · Fasting not stated · Turnaround 14 - 21 days

    Method and collection
    Method
    Enzyme-linked immunosorbent assay (ELISA)
    Collection
    Separate serum from cells within one hour of collection. Transfer to a plastic transport tube before shipping.
    Labcorp catalog page

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Sources

Verify these ranges and sources

We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.

Interpret your own results with a licensed clinician, or track your lab history and health goals in Aumnivida.

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