The blood investigations done to assess cardiac functioning usually they don't do those tests which detect steroid use.
But still these anabolic steroids can raise blood sugar or alter the liver enzymes
It is possible for tests to detect synthetic/anabolic steriod use.
There are specific test for detecting testosterone in blood that would not correspond to normal levels of natural testosterone of the body, but that would have to be specifically noted to be tested for on the blood work (it is not a "routine" test).
There are also other body samples that can be tested as new technologies arise, such as in the urine, saliva, even hair samples.
However anabolic steroids can result in adverse effects like
Increased low-density lipoprotein cholesterol (the bad cholesterol)
Decreased high-density lipoprotein cholesterol (the good cholesterol)
High blood pressure (hypertension)
Heart and circulatory problems.
So further Ultrasound heart, echocardiogarphy, Holter monitor should be done in your case.
I hope this helps.
If you have any further query then feel free to ask.
Positive feedback and bonus are highly appreciated.