Stability of 21 Antihypertensive Drugs in Serum Collected in Standard (Non-Gel) Serum Tubes versus Tubes Containing a Gel Separator

AbstractBackground:Therapeutic drug monitoring (TDM) of antihypertensive drugs is being increasingly used to optimize treatment and to assess non-adherence. Separator gels are often used in blood collection tubes to facilitate serum or plasma separation from other blood constituents before analyses.