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Newborn Screening Ontario
Expanded Hearing Screening

Unsatisfactory Result/ Unable to Test

If a baby has been referred to audiology and Newborn Screening Ontario (NSO) has received consent to proceed with expanded hearing screening, NSO will try to locate the baby’s dried blood spot. If a suitable sample is located it will be tested.  However, in some instances that isn't possible.

1.  No sample can be identified: This could be because a dried blood spot sample was never obtained or the personal health identifiers provided did not lead to a match (for example, no health card number provided and a change of name).  If a baby is less than 3 weeks of age, a dried blood spot can still be taken for the purposes of expanded hearing screening (and newborn screening if this has not already been completed).

2.  A sample is located but there is insufficient sample remaining to perform the test.  If a baby is less than 3 weeks of age, a dried blood spot can still be taken for the purposes of expanded hearing screening (and newborn screening if this has not already been completed).

3.  A sample is located but was collected from a baby at  greater than 3 weeks of age.  The hearing loss risk factor blood spot screen for cCMV infection can only be performed on a sample that is obtained by 3 weeks of age.  Testing a sample obtained after 3 weeks of age is not a reliable screen for cCMV.

In all of these scenarios a letter will be sent to the Infant Hearing Program informing them that NSO was unable to test a sample.