S

Includes the site mnemonic. This type is optional and can be used in screening, patient, and randomization sequence numbers.

T

Includes the stratification code. This type applies to randomization sequence numbers and is required if the randomization type is Central Stratified or Stratified by Site.

Q

Includes a numeric value assigned sequentially to each new patient who is screened, enrolled, or randomized. This type is required for all sequence number format definitions.