Primobolan and detection time

Can anyone tell me the dectection time of primobolan depot? If I get tested about 4 months after my last shot is there a chance that primo will show up positive? Also, does the tester have to test specifically for primobolan or can it show up along with the Test ratio? I ask this because I know athletes test positive for nandrolone all the time and I figure everyone(NCAA, Olympics, NFL) test for nandrolone due to its popularity, however I have never heard of an athlete testing positive for primobolan. So how is is detected? Thanks