Final answer:
An upper endoscopy is the diagnostic examination anticipated for a patient with black tarry stools, as it allows for direct visualization of the upper gastrointestinal tract to identify causes of bleeding.
Step-by-step explanation:
The nurse would anticipate an upper endoscopy for a patient with black tarry stools, which is medically referred to as melena.
This symptom typically suggests upper gastrointestinal bleeding, possibly from conditions such as peptic ulcers, which are best visualized through this procedure.
An upper endoscopy involves the insertion of a tiny camera through a tube, called an endoscope, to examine the patient's upper GI tract for abnormalities.
By viewing the image created by the camera on a screen, the doctor can diagnose and sometimes treat the underlying cause of the bleeding.