Understanding A.R. Numbers in Pharmaceutical Clinical Trials

An A.R. number, or activity reference number, is a unique identifier assigned to each clinical trial conducted under good clinical practice (GCP) guidelines.

It consists of three parts:

1. Country code

2. Two-digit year in 69 to yy formats

3. An eight digits sequence number starting 0000-0001 that uniquely identify protocol (serial no) with last digit as check digits i.e. [A].

A.R. Number format : IN/yy/ ####/ ## [A]