Your doctor says everything looks fine, but you still feel terrible. The problem might not be your health but how labs define “normal.” Understanding the difference between normal and optimal could ...

Laboratory testing supports most clinical decision-making; however, the concept of a fixed “normal” value is theoretical. Studies have suggested that approximately 7 out of 10 clinical decisions rely ...

Parathyroid hormone levels at the upper end of the normal range (above 56 pg/mL) are linked to a 61% increase in all-cause mortality risk.

HARP Doctoral Research Fellow and Haematology Registrar, Queen Mary University of London Stephen Hibbs receives funding from the Wellcome Trust through a HARP doctoral research fellowship. Kari ...

Please provide your email address to receive an email when new articles are posted on . Researchers created thyroid function reference ranges adjusted for age, sex and racial-ethnic background. Using ...

Brody H. Foy does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...

Labs calculate normal by testing everyone who walks through the door, including patients with undiagnosed conditions and chronic diseases. The middle 95 percent becomes the reference range, whether ...