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Fragile X Syndrome (FXS)

Test for carrier status of fragile X syndrome (FXS), the most common inherited cause of intellectual disability and autism.

Avero Carrier Test Genetics

Test Code


CPT Code


Specimen Type

Whole blood or mouthwash specimens accepted.


  1. Complete the test requisition form (provided separately).
  2. Peel off label from the test requisition and label tube with patient’s name and date of birth. Failure to provide two patient identifiers will prevent or delay testing.
  3. Follow collection protocol based on sample type in kit.
  4. Put the sample in the specimen bag with the absorbent sleeve and seal the bag.
  5. Insert completed test requisition form into outer pocket of specimen bag.


5 days ambient. 10 days refrigerated.
Store at room temperature 65 – 86°F (18 – 30°C).

Turn Around Time

7 – 10 days

Carrier testing for fragile X is not performed in males. Reflexive Xpansion Interpreter® testing is provided for female carriers of 55 – 90 CGG repeats.

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Download the requisition.