FAPPL - Clinical: Atypical Pneumonia Panel

Test Catalog

Test ID: FAPPL    
Atypical Pneumonia Panel

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

Chlamydia and Chlamydophila Antibody Panel 3 (IgG, IgA, IgM)

C.Trachomatis, C.Pneumoniae, C.Psittaci  (IgG, IgA, IgM )

Reference Range:   IgG < 1:64

                             IgA < 1:16

                             IgM < 1:10


The immunofluorescent detection of specific antibodies to Chlamydia trachomatis, Chlamydophila pneumoniae, and C. psittaci may be complicated by crossreactive antibodies, non-specific antibody stimulation, or past exposure to more than one of these organisms. IgM titers of 1:10 or greater are indicative of recent infection; however, IgM antibody is very crossreactive, often demonstrating titers to multiple organisms. Any IgG titer may indicate past exposure to that particular organism. Infection by a particular organism typically yields IgG titers that are higher than antibody titers to non-infecting organisms. IgA titers may help to identify the infecting organism when crossreactive IgG is present.  IgA is typically present at low titers during primary infection, but may be elevated in recurrent exposures or in chronic infection.


Legionella Pneumophila Antibodies (Total)

  L. pneumophila (serogroup 1) and (serogroups 2-6, 8)


Reference Ranges:  <1:16


Total antibodies to Legionella pneumophila serogroup 1 and 6 additional L. pneumophila serogroups (2, 3, 4, 5, 6, 8) are measured using a polyvalent conjugate.


The antibody response to Legionella may be detected 4 days to 6 weeks after exposure and may remain elevated for months or years.  Thus, a fourfold or greater rise in titer is required to confirm a diagnosis of current infection. Serologic testing does not usually allow definitive differentiation of Legionella serogroups.


Mycoplasma Pneumoniae Antibody (IgG)


Reference Range:    <=0.90


Interpretive criteria;

    <=0.90    Negative

   0.91-1.09  Equivocal

    >=1.10    Positive


A positive result indicates that the patient has antibody to Mycoplasma. It does not differentiate between an active or past infection. The clinical diagnosis must be interpreted in conjunction with the clinical signs and symptoms of the patient.


Mycoplasma Pneumoniae Antibody (IgM)


Reference Range:  <770 U/mL


Interpretive criteria:

      <770 U/mL       Negative

      770-950 U/mL   Low positive

       >950 U/mL      Positive