Tag: Diagnostic accuracy

According to some manufacturers, unopened refrigerated hCG controls are stable until their listed expiration date, while opened controls often have a much shorter life span, sometimes just 31 days. Understanding precisely **how long are hCG controls good for** is critical for maintaining the accuracy and reliability of diagnostic testing.

According to instructions from major medical centers like Stanford Health Care, patients must avoid antacids before an upper GI endoscopy. Understanding **why no antacids before endoscopy** is a crucial part of preparing for the procedure and ensuring its success.