His study found that presence of at least one or two pituitary hormone dysfunctions was 32%. While most pituitary dysfunctions resolve within 12 to 24 monoths, a third of those with TBI might have ongoing problems, especially with the hormone known as human growth hormone. The diagnosis of this condition is not a blood test as commonly believed. It is a four hour, rather difficult test, which involves drinking glucose and taking blood samples over that period of time. Only a few centers in the country are currently doing this type of testing. In our experience, 10 out of 20 of our clients, so tested, have been found to be HGH deficient. All of them have shown a great deal of recovery in energy, motivation and initiative after receiving their daily shots of growth hormone. Insurance companies are terrible to work with regarding human growth hormone shots, so if coverage is cut off on someone properly diagnosed an attorney must be called.