What is the reference range for Chlamydophila pneumoniae IgA?

The standard reference range for Chlamydophila pneumoniae IgA is Negative 1.10 (index values, assay-dependent).. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Chlamydophila pneumoniae IgA?

Chlamydophila pneumoniae IgA is measured in 2 tests on BiomarkersLabs.com, including Chlamydophila pneumoniae Antibodies (IgG, IgA, IgM), Chlamydophila pneumoniae Antibodies (IgM, IgG, IgA).

Biomarker Reference · C. pneumoniae IgA

What does the Chlamydophila pneumoniae IgA test measure?

Chlamydophila pneumoniae IgA (C. pneumoniae IgA) is a clinical biomarker used in autoimmune-inflammation assessment. IgA antibodies to C. It is measured in 2 laboratory tests on BiomarkersLabs.com.

Reference Range: Negative <0.90; Equivocal 0.90–1.10; Positive >1.10 (index values, assay-dependent).
Units: Index, titre, Index value
Measured In: 2 tests
Category: Autoimmune

Functional medicine optimalNegative index value in the absence of active respiratory or systemic inflammation.

What is Chlamydophila pneumoniae IgA?

IgA antibodies to C. pneumoniae reflect mucosal immune activation and can be elevated in both acute respiratory infection and in chronic or recurrent states. IgA may persist longer than IgM after resolution of symptoms, and its presence alongside IgG has been proposed as a serological signature of chronic infection or reactivation, though the evidence for this remains contested.

Why is Chlamydophila pneumoniae IgA measured?

Elevated IgA supports active or recent mucosal involvement. In research contexts IgA has been associated with atherosclerotic plaque inflammation and chronic respiratory conditions, prompting its inclusion in three-class antibody panels. Interpretation must account for the limited specificity of IgA and the high background seroprevalence of C. pneumoniae.

Reference ranges

Standard reference: Negative <0.90; Equivocal 0.90–1.10; Positive >1.10 (index values, assay-dependent).
Functional medicine optimal: Negative index value in the absence of active respiratory or systemic inflammation.
Units: Index, titre, Index value

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure Chlamydophila pneumoniae IgA

2 tests on BiomarkersLabs.com include this biomarker.

BML-AUT-019Comprehensive

Chlamydophila pneumoniae Antibodies (IgG, IgA, IgM)

Chlamydophila pneumoniae IgA reference range in this test: Negative <1.0 index; equivocal 1.0–1.09; positive ≥1.10 (assay-specific).

BML-AUT-020Comprehensive

Chlamydophila pneumoniae Antibodies (IgM, IgG, IgA)

Chlamydophila pneumoniae IgA reference range in this test: Negative <0.90; Equivocal 0.90–1.10; Positive >1.10 (index values, assay-dependent).

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Chlamydophila pneumoniae IgGC. pneumoniae IgG2 tests Chlamydophila pneumoniae IgMC. pneumoniae IgM2 tests

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