Specify a server during an [ADSI] command

Function Get-ADObjectOU {
# ----------------------------------------------------------------------------------------------
# Function outputs the Objects containing OU
#  - Requires Distinguished Name as input 
#  - Outputs the containing OU
# ----------------------------------------------------------------------------------------------
    Param (
        [parameter(Mandatory=$true, 
        ValueFromPipelineByPropertyName=$true)][alias("dn")][String]$DistinguishedName
    )
    
    $ou = ([ADSI]"LDAP://$DistinguishedName").parent -replace 'LDAP://'
    if( $ou.Length -eq 0 ) {
        Write-Host -ForegroundColor Red "ERROR: Parent OU cannot be found because the DistinguishedName does not exist."
        break
    } else {
        $ou
    }
    
} # End Get-ADObjectOU

I am making several changes just before this where I use "-Server dc.mydomain.com" and replication does not have all controllers up to date for a few seconds.  I want to be sure I am using the same DC that I used to make the changes prior to this command. 

How can I specify the server to use in the above example?

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