TO OBTAIN A 24-HOUR SPECIMEN OF URINE.
Begin early in the morning. Throw away the first urination. Save all further urinations for the next twenty-four hours. For instance: Patient urinates at 6 a.m. This first urination is thrown away, or saved for an a.m. specimen if required and patient’s bladder is empty. Save all succeeding urinations for the next twenty-four hours, at the end of which time (6 a.m.) request the patient to urinate, and save the last urination also, to complete the specimen. This gives us twenty-four hours’ secretion.
The addition of solution of formaldehyd (fʒij) to a twenty-four hour specimen of urine will preserve it, and prevent fermentation before the analysis is made.