II. Indication
- Chlamydia screening in symptomatic and asymptomatic patients
III. Background
- Chlamydia Antigen testing has replaced Chlamydia culture
- Nucleic Acid Amplification Tests (NAAT, PCR) are the primary tests used in the U.S. for Chlamydia detection
IV. Precautions
- Avoid rapid point-of-care Chlamydia tests (very low accuracy, see below)
V. Labs
VI. Technique
- General
- Eye Sample
- Topical Eye Anesthetic applied
- Swab lower and upper lids (inner surface)
- Urethral Samples (Males)
- Cervical Samples
- Vaginal Sample
- Vaginal swabs have similar accuracy to endocervical swabs
- In contrast, Pap SmearNAAT liquid cytology has lower Test Sensitivity than endocervical and vaginal samples
- Rectal Samples (symptomatic patients)
- Insert Dacron swab 3 cm into anal canal
- Withdraw swab
- Fecal contaminated samples should be redone
- Urine Sample
- Obtain first catch, "dirty" urine without applying antiseptic before voiding
- May miss up to 10% of Cervicitis cases (compared with endocervical swabs)
VII. Efficacy
- Chlamydia Nucleic Acid Amplification Tests (NAAT, PCR)
-
Chlamydia DFA, EIA (older methods, replaced by PCR)
- Test Sensitivity: 88-91%
- Test Specificity: 97-99%
- Chlamydia Rapid Point-Of-Care Tests (avoid, very high False Negative Rate)
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Related Studies
Concepts | Immunologic Factor (T129) |
SnomedCT | 121018001 |
LNC | LP37610-0, MTHU006874 |
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English | Chlamydia sp Ag, Chlamydia sp Antigen, Chlamydia species antigen (substance), Chlamydia species antigen |
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Spanish | antígeno de Chlamydia trachomatis (sustancia), antígeno de Chlamydia trachomatis |
Ontology: Chlamydia trachomatis DNA:ACnc:Pt:Bld:Ord:Probe.amp.tar (C0799746)
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SnomedCT | 166304004, 143668007, 399193003 |
English | Polymerase chain reaction for Chlamydia trachomatis (procedure), Chlamydia trachomatis polymerase chain reaction (procedure), Chlamydia trachomatis polymerase chain reaction, PCR test for Chlamydia trachomatis, Polymerase chain reaction for Chlamydia trachomatis |
Spanish | prueba de reacción de la polimerasas en cadena para Chlamydia trachomatis (procedimiento), prueba de reacción de la polimerasas en cadena para Chlamydia trachomatis |
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SnomedCT | 46261000009101 |
English | Polymerase chain reaction for Chlamydia (procedure), Chlamydia PCR, Polymerase chain reaction for Chlamydia |