The phrase "addition to the routine" is correct and usable in written English.
It can be used when referring to something that is being added or included in an established set of activities or practices.
Example: "We decided to implement an addition to the routine by incorporating a daily team check-in."
Alternatives: "supplement to the routine" or "enhancement to the routine".
In addition to the routine pregnancy controls, creatinine clearance on 24 hour urine collection is routinely required at referral; all patients undergo (at least) a monthly determination of serum creatinine and dipstick proteinuria, uric acid, urinalysis and urinary culture, serum electrolytes, coagulation and blood cell counts.
In addition to the routine maintenance, large "streetscape" efforts similar to the Valencia Street project are planned for sections of Cesar Chavez and Balboa Streets.
In addition to the routine business of the meeting, the Times Company is asking shareholders to authorize a new class of stock to represent New York Times Digital, the company's Internet business division.
In addition to the routine checking, ROS measurement was performed immediately on fresh samples.
In addition to the routine 24 h IVS VLBI sessions, specially designed observation campaigns are set up at the Geodetic Observatory Wettzell (Bavarian Forest, Germany).
In addition to the routine clinical work-up, the pathologist was asked to follow a sector-based reporting scheme, consistent with the radiologist PI-RADS report.
In addition to the above routine, services to prevent parent to child transmission of HIV were offered at two of the facilities as a pilot programme.
The Guangzhou Center for Disease Control and Prevention GZCDCC) established enhanced surveillance in addition to the existing routine LPM surveillance to assess its effect on H7N9 virus isolation and survival.
The most important is that the near-peer course in the intervention group was taught in addition to the mandatory routine course.
In addition to the usual routines of going to class, writing papers and falling in and out of love, students have been occupied by save-the-college strategy sessions, transfer deadlines and the possibility that they will have to repay their college loans early.
In addition to the funky routines with attitude, there's some basics including the "Lean Livable Lifestyle" guide to make you feel more focused and deeply fit".
