What does a miscarriage look like. Medically reviewed by Carolyn Kay, MD. Everything you need to know about Test P. Medically reviewed by Rachel Liberto, R. Pregnancy tests check hCG levels in the urine or blood to determine if the test in positive or negative. HCG injection is also approved by the U. In men, doctors prescribe hCG to combat the symptoms of hypogonadism, such as low testosterone and infertility. It can help the body increase production of testosterone and increase sperm production, which can reduce infertility.