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4.4.3 Duration component (ST)

Definition: This field indicates how long the service should continue after it is started. The default is INDEF (do indefinitely). This component is coded as follows:

S<integer>

=

<integer> seconds

M<integer>

=

<integer> minutes

H<integer>

=

<integer> hours

D<integer>

=

<integer> days

W<integer>

=

<integer> weeks

L<integer>

=

<integer> months

X<integer>

=

<integer> times at interval specified in the order. A request for 2 blood cultures Q2H X3 would imply obtaining 2 blood cultures 3 different times at 2-hour intervals for a total of 6 blood cultures.

T<integer>

=

at the interval and amount stated until a total of <integer> "DOSAGE" is accumulated. Units would be assumed to be the same as in the QUANTITY field.

INDEF

=

do indefinitely - also the default

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