Method for predicting amount of analyte in urine specimen

A method for predicting an amount of a metal in urine collected from a subject during a target time period, the method comprising:

• administering a chelating agent for chelating the metal to the subject;
• measuring an amount of the metal in urine collected for a predetermined time period of 0.1 to 3 hours from the subject within 0 to 6 hours after administering the chelating agent to the subject;
• and
• correlating the measured amount of the metal in urine collected for the predetermined time period from the subject with an amount predicted to be collected in urine from the subject during the target time period based upon a correlation equation that correlates an amount of metal measured in urine collected from a plurality of subjects during the predetermined time period after administering the chelating agent to the plurality of subjects to an amount of metal measured in urine collected from the plurality of subjects during the target time period, wherein the target time period is a period starting from administering the chelating agent and ending at from 6 to 24 hours after administering the chelating agent.