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Order Code PNTO Streptococcus pneumoniae IgG Antibodies, Total, Serum


Ordering Guidance


This test is the preferred test for patients previously tested for Streptococcus pneumoniae antibodies (as part of follow up testing or part of pre/post vaccine assessment).

 

The preferred test for patients being evaluated for possible immunodeficiency or for assessment of pneumococcal vaccination response (initial evaluation) is PNTOR / Streptococcus pneumoniae IgG Antibodies, Total, with Reflex, Serum.

 

The preferred test for patients previously tested for S pneumoniae serotypes (as part of follow up testing or part of pre/post vaccine assessment) is PN23M / Streptococcus pneumoniae IgG Antibodies, 23 Serotypes, Serum.



Specimen Required


Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions: Centrifuge and aliquot serum into a plastic vial.


Useful For

Assessing the IgG antibody response to active immunization with nonconjugated 23-valent pneumococcal vaccines

 

Assessing the IgG antibody response to active immunization with conjugated 13-valent, 15-valent and 20-valent pneumococcal vaccines

 

Determining the ability of an individual to produce an antibody response to polysaccharide antigens, as part of an evaluation for humoral or combined immunodeficiencies

Method Name

Enzyme-Linked Immunosorbent Assay (ELISA)

Reporting Name

S. pneumoniae IgG Ab, Total, S

Specimen Type

Serum

Specimen Minimum Volume

0.3 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 21 days
  Frozen  21 days

Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK
Heat-inactivated specimen Reject

Reference Values

≥9.7 mcg/mL

Method Description

Pneumococcal capsular polysaccharide (PCP) antibodies bind to the wells of a microwell plate pre-coated with PCP antigen (1, 2, 3, 4, 5, 6B, 7F, 8, 9N, 9V, 10A, 11A, 12F, 14, 15B, 17F, 18C, 19F, 19A, 21, 22F, 23F, 33F). Calibrators and controls are pre-adsorbed with C-polysaccharide (CPS) and samples are diluted in a diluent containing CPS. The calibrators, controls, and patient samples are added to the wells and antibodies recognizing the PCP antigen bind during the first incubation. After washing the wells to remove all unbound proteins, purified peroxidase labelled rabbit anti-human IgG (gamma-chain specific) conjugate is added. The conjugate binds to the captured human antibody and the excess unbound conjugate is removed by another wash step. The bound conjugate is incubated with 3,3',5,5'-tetramethylbenzidine (TMB) substrate, which gives a blue reaction product. The enzyme reaction is stopped by adding phosphoric acid, which produces a yellow end point color and is read at 450nm. The optical density (OD) of the solution at 450 nm is directly proportional to the concentration of antibody in the sample. The standard curve is established by plotting the antibody concentrations of the calibrators (x-axis) and their corresponding measured OD values (y-axis).(Unpublished Mayo method)

Day(s) Performed

Tuesday, Thursday

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

86317