- Early Term: between 37 weeks 0 days and 38 weeks 6 days
- Full Term: between 39 weeks 0 days and 40 weeks 6 days
- Late Term: between 41 weeks 0 days and 41 weeks 6 days
- Post Term: between 42 weeks 0 days and beyond
- Premature (Preterm): an infant born at an estimated gestational age of less than 37 weeks
- Late Preterm: an infant born between 34 - 36 6/7 weeks gestation. “Late preterm” replaces earlier terminology of “near term.”
- Post Term: an infant born between 42 weeks 0 days and beyond
- Chronologic Age: time since birth
- Adjusted Age or Corrected Age: age corrected for prematurity
- Gestational Age: estimated time since conception
- Gestational Age Classifications: [Eds: 2012]
- moderate to late preterm: 32 to <37 weeks
- very preterm: 28 to <32 weeks
- extremely preterm: <28 weeks
- Low Birth Weight (LBW): <2500 grams (5 lbs, 8 oz)
- Very Low Birth Weight (VLBW): <1500 grams (3 lbs, 5 oz)
- Extremely Low Birth Weight: <1000 grams (2 lbs, 3 oz)
|Author:||Jennifer Goldman-Luthy, MD, MRP, FAAP - 10/2014|
|Content Last Updated:||5/2015|
ACOG Committee Opinion No 579: Definition of term pregnancy.
Obstet Gynecol. 2013;122(5):1139-40. PubMed abstract / Full Text
For the press release of the definition change, see http://www.acog.org/About-ACOG/News-Room/News-Releases/2013/Ob-Gyns-Redefine-Meaning-of-Term-Pregnancy
TeKolste T, Bragg J, Wendel S.
Extremely Low Birth Weight NICU Graduate.
2004; Washington State Department of Health, Children with Special Health Care Needs Program; http://www.medicalhome.org/4Download/cec/elbw.pdf
Supplement to: Low Birth Weight Neonatal Intensive Care Graduate. Specifically addresses post-NICU care of ELBW infants who: 1) experienced the usual complications associated with extreme prematurity and/or extreme low birth weight, and 2) were discharged home in a relatively healthy condition.