Where used:
| Attribute | MEASURED PERSON OBSERVATION TYPE CODE | references in description Gestation Length In Days |
| Data Element | GESTATION (DATING ULTRASOUND SCAN) | references in description Gestation Length In Days |
| Data Element | GESTATION LENGTH (AT 6 - 8 WEEK PHYSICAL EXAMINATION) | references in description Gestation Length In Days |
| Data Element | GESTATION LENGTH (AT BIRTH) | references in description Gestation Length In Days |
| Data Element | GESTATION LENGTH (PREGNANCY FIRST CONTACT) | references in description Gestation Length In Days |
| Supporting Information | Gestation Length In Days | references in description Gestation Length In Days |