LAB3146
Collect
Serum separator tube OR CSF.
Specimen Preparation
Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum OR CSF to an ARUP Standard Transport Tube. (Min: 0.15 mL) Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of acute specimens. Mark specimens plainly as "acute" or "convalescent."
Unacceptable Conditions
Contaminated or severely lipemic specimens.
Storage/Transport Temperature
Refrigerated.
Stability (from collection to initiation)
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)
Notes
CF measures both IgM and IgG. As single antibody titers are generally not diagnostic, paired specimens are preferred. Acute and convalescent specimens (drawn at least 21 days apart), showing at least a fourfold rise in titer, are diagnostic.
Negative fungal serology does not rule out the possibility of current infection.
Negative fungal serology does not rule out the possibility of current infection.
Performed
Sun-Sat
Methodology
Semi-Quantitative Complement Fixation
Reported
1-3 days
Synonyms
- Valley Fever by CF
- San Joaquin Fever Antibody by CF
- LAB3146
Ordering Recommendations
Titers may aid in monitoring coccidioidomycosis (Valley fever) and treatment response. For the initial establishment of diagnosis, refer to the preferred panel (0050588), which combines complement fixation and immunodiffusion.
Reference Interval
Less than 1:2
Interpretive Data
Any titer suggests past or current infection. However, greater than 30 percent of cases with chronic residual pulmonary disease have negative Complement Fixation (CF) tests. Titers of less than 1:32 (even as low as 1:2) may indicate past infection or self-limited disease; titers greater than or equal to 1:32 may indicate disseminated infection. CF serology may be used to follow therapy. Antibody in CSF is considered diagnostic for coccidioidal meningitis, although 10 percent of patients with coccidioidal meningitis will not have antibody in CSF.
CPT Codes
86635
Collection |
LAB3146
Collect
Serum separator tube OR CSF.
Specimen Preparation
Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum OR CSF to an ARUP Standard Transport Tube. (Min: 0.15 mL) Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of acute specimens. Mark specimens plainly as "acute" or "convalescent."
Unacceptable Conditions
Contaminated or severely lipemic specimens.
Storage/Transport Temperature
Refrigerated.
Stability (from collection to initiation)
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)
Notes
CF measures both IgM and IgG. As single antibody titers are generally not diagnostic, paired specimens are preferred. Acute and convalescent specimens (drawn at least 21 days apart), showing at least a fourfold rise in titer, are diagnostic.
Negative fungal serology does not rule out the possibility of current infection.
Negative fungal serology does not rule out the possibility of current infection.
Ordering |
Performed
Sun-Sat
Methodology
Semi-Quantitative Complement Fixation
Reported
1-3 days
Synonyms
- Valley Fever by CF
- San Joaquin Fever Antibody by CF
- LAB3146
Ordering Recommendations
Titers may aid in monitoring coccidioidomycosis (Valley fever) and treatment response. For the initial establishment of diagnosis, refer to the preferred panel (0050588), which combines complement fixation and immunodiffusion.
Result Interpretation |
Reference Interval
Less than 1:2
Interpretive Data
Any titer suggests past or current infection. However, greater than 30 percent of cases with chronic residual pulmonary disease have negative Complement Fixation (CF) tests. Titers of less than 1:32 (even as low as 1:2) may indicate past infection or self-limited disease; titers greater than or equal to 1:32 may indicate disseminated infection. CF serology may be used to follow therapy. Antibody in CSF is considered diagnostic for coccidioidal meningitis, although 10 percent of patients with coccidioidal meningitis will not have antibody in CSF.
Administrative |
CPT Codes
86635