They check your platelet count
, your red blood cell count, and for abnormalities in the chemical components that help your blood to clot normally. Steroids would not be picked up on these tests.
I'm not sure what you mean by injectable steroids. Anti-inflammatory prescription corticosteroids
will increase blood sugar
levels and might show up for that reason. They can also slow healing and increase the risk of infection. Anabolic steroids
, which are often used illegally to build muscle mass
, can lead to other problems, not the least of which is that, because they are acquired and used illegally, they may have impurities and are of unknown dosage.
You should discuss this with your doctor. He or she needs to know about any medications you're taking--legal or not--and is not going to report you to the police if you're using something illegal.