Nitrazine-pH indicator dye
Performed at authorized locations by point of care operators. To differentiate gastric from intestinal aspirates in the placement and maintenance of gastric or intestinal tubes when used in addition to four non-radiologic verification methods.
Reference ranges are available in the pH Nitrazine Paper for Gastric and Amniotic Fluid test procedure located on the POC website: https://www.pathology.med.umich.edu/point-of-care.
Flush tube with 3 mL of air before aspirating gastric or intestinal specimen. Withdraw sufficient volume to ensure that any feeding left in the tube lumen does not affect pH.
For more test specific information, please refer to the test procedure found on the Michigan Medicine POC website: https://www.pathology.med.umich.edu/point-of-care