Test Overview
Test Methodology

Enzyme Immunoassay

Test Usage

Assessment of preterm delivery risk.

Reference Range *


* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Soft Order Code
MiChart Code
Fetal Fibronectin
  • FFN
Chemical Pathology
STAT Availability

STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required).

Specimen Requirements
Collection Instructions

The specimen should be obtained from the posterior fornix of the vagina during a speculum examination. The Hologic Rapid fFN Collection Kit is the only acceptable specimen collection system which can be used to collect specimens for this assay. The Dacron swab provided in the Specimen Collection Kit should be inserted into the vagina and lightly rotated across the posterior fornix for approximately 10 seconds to absorb the cervicovaginal secretions. Once the specimen is obtained, carefully remove the swab from the vagina and place it into the tube of buffer provided with the Specimen Collection Kit. Use only one Specimen Collection Device per patient. To safely interpret the Fetal Fibronectin Enzyme Immunoassay or Rapid fFN test result, the sample must be collected before performance of any activities or procedures which might disrupt the cervix, e.g., coitus, digital cervical examination, vaginal ultrasound, microbiologic culture of cervical secretions, or pap smear. Finally, the test result is invalid if the swab is contaminated by lubricants, soaps, or disinfectants, e.g., K-Y Jelly lubricant, Betadine disinfectant, hexachlorophene, Monistat cream. Soaps or disinfectants may interfere with the antibody-antigen reaction. The method of collection is also described in the directional insert for the Specimen Collection Kit. Send at room temperature within 8 hours of collection or refrigerate for up to 3 days.

Do not collect specimen if patients have had sexual intercourse within 24 hours prior to sampling; moderate or gross vaginal bleeding; advanced cervical dilation (3 cm or greater); rupture of membranes; gestational age <22 weeks or >35 weeks; or suspected or known placental abruption or placenta previa.
CPT Code
Fee Code