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Health Information Center

Diagnosis of Chlamydia

  • Cynthia M. Johnson, MA
Publication Type:

Condition InDepth

Diagnosis of Chlamydia

Most people do not have symptoms. They will be tested if they are at high risk.

In others, the doctor will ask about symptoms and health history. Questions will also be asked about sexual history. A physical exam will be done. Chlamydia may be suspected in people who have symptoms.

Chlamydia is tested with a nucleic acid amplification test (NAAT). A swab of fluid will be taken from the penis, cervix, throat, or rectum. A urine sample may also be taken. The sample will be tested to look for signs of infection.


  • Chlamydia—CDC detailed fact sheet. Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/std/chlamydia/STDFact-chlamydia-detailed.htm.
  • Chlamydia genital infection. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/chlamydia-genital-infection.
  • Sexually transmitted diseases treatment guidelines. Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/std/treatment-guidelines/default.htm.


  • Elizabeth Margaret Prusak, MD
Last Updated:

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.