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4.4.2 Interval component (CM)

Subcomponents: <repeat pattern (IS)> ^ <explicit time interval (ST)>

Definition: This field determines the interval between repeated services.

The default is one time only, the first subcomponent is the repeat pattern, and the second subcomponent is the explicit time at which pattern is to be executed.

4.4.2.1 Repeat pattern

Definition: The repeating frequency with which the treatment is to be administered. It is similar to the frequency and SIG code tables used in order entry systems. The following is preferred syntax for repeat patterns:

User-defined table 4001 - Repeat pattern

Q<integer>S

every <integer> seconds

Q<integer>M

every <integer> minutes

Q<integer>H

every <integer> hours

Q<integer>D

every <integer> days

Q<integer>W

every <integer> weeks

Q<integer>L

every <integer> months (Lunar cycle)

Q<integer>J<day#>

repeats on a particular day of the week, from the French jour (day). If <integer> is missing, the repeat rate is assumed to be 1. Day numbers are counted from 1=Monday to 7=Sunday. So Q2J2 means every second Tuesday; Q1J6 means every Saturday.

BID

twice a day at institution-specified times (e.g., 9AM-4PM)

TID

three times a day at institution-specified times (e.g., 9AM-4PM-9PM)

QID

four times a day at institution-specified times (e.g., 9AM-11AM-4PM-9PM)

xID

"X" times per day at institution-specified times, where X is a numeral 5 or greater. E.g., 5ID=five times per day; 8ID=8 times per day

Note: None of the above three specifications are equivalent to their Q<integer>H counterpart. QID is not Q6H. The former is unequally spaced; the latter is equally spaced.

QAM

in the morning at institution-specified time

QSHIFT

during each of three eight-hour shifts at institution-specified times

QOD

every other day (same as Q2D)

QHS

every day before the hour of sleep

QPM

in the evening at institution-specified time

C

service is provided continuously between start time and stop time

U <spec>

for future use, where <spec> is an interval specification as defined by the UNIX cron specification.

PRN

given as needed

PRNxxx

where xxx is some frequency code (e.g., PRNQ6H); given as needed over the frequency period.

Once

one time only. This is also the default when this component is null.

The first subcomponent may repeat, with repeat values separated by a space. The repeats are interpreted as connected by logical ANDs. E.g.,

Twice per day, every other day: BID QOD

Three times per day, Monday Wednesday and Friday: TID QJ135

Because of this syntax, repeat values should never contain blanks. If a free text frequency, such as "Twice a day, every other day" is to be sent, use the text component (component 8).

4.4.2.2 Explicit time interval subcomponent

Definition: This field explicitly lists the actual times referenced by the code in the first subcomponent, in the following format: HHMM,HHMM,HHMM,.… This second subcomponent will be used to clarify the first subcomponent in cases where the actual administration times vary within an institution. If the time of the order spans more than a single day, this new subcomponent is only practical if the same times of administration occur for each day of the order. If the actual start time of the order (as given by the fourth subcomponent of the quantity/timing field) is after the first explicit time, the first administration is taken to be the first explicit time after the start time. In the case where the patient moves to a location having a different set of explicit times, the existing order may be updated with a new quantity/timing field showing the changed explicit times.

Ex: 2nd component of quantity/timing field:

...^QID&0230,0830,1430,2030^...

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