This value set includes codes from the following code systems:

• The following codes from system: 409496000:{704326004=77465005}

  Code	Display	900000000000003001 (en-US)
  255246003	1. Trimester	First trimester (qualifier value)
  255247007	2. Trimester	Second trimester (qualifier value)
  255248002	3. Trimester	Third trimester (qualifier value)

• The following codes from system: NASK

  Code	Display
  ASKU	asked but unknown
  NASK	not asked