A Client Who Will Undergo Gastric Testing with Histamine Is

A client who will undergo gastric testing with histamine is currently taking ranitidine (Zantac) .The nurse complies with standard preprocedure teaching by instructing the client to do which of the following?

A) Avoid taking ranitidine for 24 hours before the test
B) Avoid taking ranitidine for 72 hours before the test
C) Take a double dose of ranitidine on the morning of the test
D) Take a double dose of ranitidine for two days before the test