The present invention provides a prediction method that enables easy prediction of the amount of an analyte in a urine specimen in a target time period after administration of a chelating agent. The prediction method of the present invention includes the step of predicting, from a measured amount of an analyte in a urine specimen collected in a predetermined time period after administration of a chelating agent, the amount of the analyte in a urine specimen collected in a target time period after the administration of the chelating agent on the basis of a correlation, wherein the correlation is a correlation between measured amounts of the analyte in urine specimens in the predetermined time period and measured amounts of the analyte in urine specimens in the target time period.
