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.