An apparatus for wrist and catheter stabilization during radial artery access includes a wrist support member and a catheter support member connected by an adjustable coupler. The wrist support member comprises a first platform with a curved surface configured to cradle a wrist in a supine or neutral position and an inclined portion to motivate extension or ulnar flexion of the wrist. The catheter support member comprises a second platform with a curved sidewall extending along at least one side of the second platform. The curved sidewall may be configured to direct a catheter toward a radial access point of the wrist when the catheter is extended across the platform portion of the catheter support member. The adjustable coupler is reconfigurable to control a height of the catheter support member from the wrist support member, as well as orientation and other height/distance parameters in some embodiments.