The presence of central precocious puberty can be determined by the presence of fasting serum luteinizing hormone greater than 5 International Units per liter (IU/L) on the Precocious Puberty Stimulation Test (PPST). Precocious puberty is generally recognized when any one or more of the secondary sexual characteristics appear before the age of 9 years in boys or 8 years in girls. Precocious puberty is generally categorized into central and peripheral precocious puberty. Central precocious puberty is usually diagnosed if the precocious puberty provocation test shows a high luteinizing hormone level of 5 international units per liter. If the luteinizing hormone level is below 5 IU per liter, some children need to undergo a sex hormone provocation test. If the provocation test reaches 5 IU per liter and the luteinizing hormone to follicle-stimulating hormone ratio is greater than 0.6-1.0, central precocious puberty is basically diagnosed as well. If the test results do not reach these levels, the child has not reached the level of precocious puberty. There are many technical terms and abbreviations in the precocious puberty stimulation test results, so it is recommended to interpret them under the guidance of a medical professional to avoid misunderstanding.