for women it is usually a self taken swab, there is no examination necessary;
for men a urine sample, if you are giving a urine sample you must not have passed urine for 1 hour prior to the test.
I found this info out on a website that tells all about chlamydia. Frisky.co.uk. Check it out and if you are in the bournemouth or poole area you can get a free test in the post, no need for embaressing conversations or appointment. I found it really good as i hate talking about these kind of things and the perscription for antibiotics is free tooo which is awesome, im a student and cant really afford them!
Good luck and I hope you are ok!!
Kit x