Reference Range(s) Creatinine is the endproduct of creatine metabolism. Creatine is present primarily in muscle and the amount of creatinine produced is related to total skeletal muscle mass. Daily creatinine production is fairly constant except when there is massive injury to muscle. The kidneys excrete creatinine very efficiently and blood levels and daily urinary excretion of creatinine fluctuates very little in healthy normal people.
Schizophrenia is a disease that has several types of symptoms, some of which start earlier than others. The more well-known symptoms, such as hallucinations and delusions, typically start when a man is around 16 to 19 years old or in his early 20s.
Schizophrenia symptoms most commonly manifest themselves between the ages of 16 and 30. It is rare for individuals who cannot drive (under age 16) and those 45 or older to show signs of the disease, though.enerally, the diagnosis for men comes a bit earlier, around age 18, than for women, who are often diagnosed in their mid-twenties. This can be problematic, as signs of schizophrenia often mimic signs of drug use. For this reason, doctors must rule out this cause of symptoms before diagnosing the disorder.