Abstract
Answer A. First-catch urine (FCU)
If chlamydia is suspected, samples should be taken for nucleic acid amplification test (NAATs) to confirm the diagnosis.
In women:
An endocervical or vulvovaginal swab can be taken Alternatively, a first-catch urine (FCU) sample can be collected if the patient prefers this
In men:
A first-catch urine (FCU) is the specimen of choice A urethral swab is an alternative
Rectal swabs should be reserved for symptomatic men and women.
National Institute for Health and Care Excellence (NICE) Clinical knowledge summaries: Chlamydia – Uncomplicated genital. https://cks.nice.org.uk/chlamydia-uncomplicated-genital#!diagnosissub:2