\u00a9 2020 wikiHow, Inc. All rights reserved. Last Updated: July 19, 2020 How long the bleeding has occurred, for example, can help rule in or out acute or chronic problems. Part 1 of 3: Collecting a Urine Sample. Do your best not to get urine on the outside of the cup. Electrocardiogram (ECH) Electrocardiogram (ECG) instructions. This image may not be used by other entities without the express written consent of wikiHow, Inc.