How long is it supposed to it take for a whooping cough test to come back?

Which test?: Nasal culture takes 10-14 days & most accurate if done before before 4th week illness. Picks up 30-50% cases pcr or polymerase chain reaction test fast (1 day) but can give false negative and false positive direct fluorescent antibody (dfa) is also quick but even less accurate than pcr nasal culture is “gold standard” but results up to 2 weeks!