Syphilis – Chancre – Direct Fluorescence
Conformément au Règlement de l’Ontario 671/92 de la Loi sur les services en français, les renseignements d’analyses de laboratoire liés à la présente page ne sont offerts qu’en anglais parce qu’ils sont de nature scientifique ou technique et destinés uniquement à l’usage des fournisseurs de soins de santé qualifiés et non aux membres du public.
Specimen Requirements
| Test Requested | Required Requisition(s) | Specimen Type | Minimum Volume | Collection Kit |
Syphilis |
Serous exudates from lesion or chancre |
Prepare 1 slide as directed in kit Instructions |
Direct Fluorescence Kit for Treponema pallidum; Kit order number 390047 |
Submission and Collection Notes
Provide clinical information, onset date and the location of the lesion on the General Test Requisition Form.
Follow instructions according to specimen type on the kit instruction sheet for Syphilis – Direct Fluorescence Kit order# 390047.
Limitations
A swab received in charcoal or antibiotic transport medium is not an acceptable specimen. If smears are prepared too thick or show signs of gross contamination with blood, they are unacceptable and the sample will not be tested. Submitter will be notified by telephone.
Due to the low sensitivity of the test, a blood sample should always be submitted for syphilis serology testing when syphilis is suspected.
Storage and Transport
Label slide with the patient’s full name and date of birth. Allow slide to dry and put it in slide mailer provided with the kit and place in a biohazard bag and seal. Failure to provide this information may result in rejection or testing delay.
Special Instructions
Specimens should be stored at 2-8 °C following collection and shipped to the Public Health Ontario Laboratory for testing. Avoid extreme temperature.
Test Frequency and Turnaround Time (TAT)
Direct fluorescence for syphilis is performed 2-3 times per week.
Turnaround time is up to 2 days from receipt by PHO laboratory.
Smears from lesions or chancres for syphilis are tested by direct fluorescence.
The syphilis test detects spirochetes by fluorescent microscopy, however, due to the low sensitivity of the test, a negative result does not rule out syphilis.
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