Parainfluenza Antibody  titer  (SI: titer)
Performed at Focus Technologies, Cypress CA
Effective 06Mar99 – present:
REFERENCE RANGE:  < 1:8

INTERPRETIVE CRITERIA:
< 1:8           Antibody Not Detected
> or = 1:8    Antibody Detected
Single titers > or = 1:64 are indicative of recent infection.  Titers of 1:8 to 1:32 may be indicative of either past or recent infection, since CF antibody levels persist for only a few months.  A four-fold or greater increase in titer between acute and convalescent specimens confirms the diagnosis.  After initial infection, antibody responses at a later date are often heterotypic and exhibit crossreactivity with other paramyxoviruses (e.g., mumps).

Effective 19Sep94 - 06Mar99: No ranges available