reVITALize: Obstetrics Data Definitions
Obstetrics Data Definitions
The reVITALize obstetric data definitions are formally endorsed by the following organizations:
- American Academy of Family Physicians
- American College of Nurse-Midwives
- The American College of Obstetricians and Gynecologists/The American Congress of Obstetricians and Gynecologists
- Association of Women's Health, Obstetric and Neonatal Nurses
- Society for Maternal–Fetal Medicine
To add your organization to this list, please contact [email protected].
Term | Definition | Notes |
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ABRUPTION |
Placental separation from the uterus with bleeding (concealed or vaginal) before fetal birth, with or without maternal/fetal compromise
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ANTENATAL STEROIDS INITIATED |
At least one dose of corticosteroids was administered to accelerate fetal maturation |
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CESAREAN-RELATED DEFINITIONS |
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CESAREAN BIRTH |
Birth of the fetus(es) from the uterus through an abdominal incision
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Add separate data item to indicate presence of labor or no labor |
LABOR AFTER CESAREAN |
Labor in a woman who has had one or more previous cesarean births. Planned labor after cesarean occurs in a woman intending to achieve a vaginal birth. Unplanned labor after cesarean occurs in a woman intending a repeat cesarean birth. |
Should qualify the intended route of birth on admission May result in a vaginal or cesarean birth |
PRIMARY CESAREAN BIRTH |
Birth of the fetus(es) from the uterus through an abdominal incision in a woman without a prior cesarean birth
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REPEAT CESAREAN BIRTH |
Birth of the fetus(es) from the uterus through an abdominal incision in a woman who had a cesarean birth in a previous pregnancy
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VAGINAL BIRTH AFTER CESAREAN |
A vaginal birth in a woman with one or more previous cesarean births |
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CLINICAL CHORIOAMNIONITIS |
Usually includes otherwise unexplained fever (at or above 38 degrees C (100.4F)) with one or more of the following: Uterine tenderness, irritability, or both
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Nonlaboring, intact membranes with unexplained fever require additional testing. Clinical diagnosis could be supported by laboratory evaluation of amniotic fluid. |
EARLY POSTPARTUM HEMORRHAGE |
Cumulative blood loss of >=1000ml or blood loss accompanied by signs or symptoms of hypovolemia within 24 hours following the birth process (includes intrapartum loss). |
Signs and symptoms of hypovolemia may include tachycardia, hypotension, tachypnea, oliguria, pallor, dizziness, or altered mental status. Cumulative blood loss of 500–999ml alone should trigger increased supervision and potential interventions as clinically indicated. A fall in hematocrit of >10% can be supportive data but generally does not make the diagnosis of postpartum hemorrhage alone. Further research is needed on blood loss for late postpartum hemorrhage. |
ESTIMATED DUE DATE (EDD) |
The best EDD is determined by last menstrual period if confirmed by early ultrasound or no ultrasound performed, early ultrasound if no known last menstrual period or the ultrasound is not consistent with last menstrual period, or known date of fertilization (eg, assisted reproductive technology) |
Ultrasound margin of error and “early” to be defined by the College. Pregnancy should not be redated by a later ultrasound after a best obstetrical estimate of EDD has been established. |
FORCEPS ASSISTANCE |
Application of forceps to the fetal head |
Should specify whether successful or unsuccessful in achieving birth; this includes both cesarean and vaginal births. |
GESTATIONAL AGE |
Gestational age (written with both weeks and days; eg, 39 weeks and 0 days) is calculated using the best obstetrical EDD based on the following formula: gestational age = (280 - (EDD - Reference Date))/ 7 |
Reference Date: date on which you are trying to determine gestational age |
GRAVIDA |
A woman who currently is pregnant or has been in the past, irrespective of the pregnancy outcome |
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GRAVIDITY |
The number of pregnancies, current and past, regardless of the pregnancy outcome |
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HYPERTENSION-RELATED DEFINITIONS |
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CHRONIC HYPERTENSION EXISTING PRIOR TO PREGNANCY |
See National Center for Health Statistics definition: elevation of blood pressure above normal for age, gender, and physiological condition. Diagnosis prior to the onset of this pregnancy which does not include gestational hypertension (pregnancy-induced hypertension). |
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CHRONIC HYPERTENSION DIAGNOSED DURING CURRENT PREGNANCY |
Hypertension diagnosed before the 20th week of current pregnancy. |
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LABOR-RELATED DEFINITIONS | ||
AUGMENTATION OF LABOR |
The stimulation of uterine contractions using pharmacologic methods or artificial rupture of membranes to increase their frequency or strength following the onset of spontaneous labor or contractions following spontaneous rupture of membranes.
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LABOR |
Uterine contractions resulting in cervical change (dilation or effacement) |
Avoid the term "prodromal labor." Can be spontaneous in onset, spontaneous in onset and subsequently augmented, or induced. |
INDUCTION OF LABOR |
The use of pharmacological or mechanical methods to initiate labor
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SPONTANEOUS LABOR AND BIRTH |
Initiation of labor without the use of pharmacological or mechanical interventions, resulting in a nonoperative vaginal birth
Still applies if any of the following are used or performed:
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SPONTANEOUS ONSET OF LABOR |
Labor without the use of pharmacological or mechanical interventions to initiate labor
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May occur at any gestational age. |
TIME OF THE ONSET OF LABOR |
The time when regular uterine contractions began that resulted in labor with or without the use of pharmacological or mechanical interventions |
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MALPRESENTATION |
Any presentation other than a vertex presentation |
Examples: Brow, face, compound, breech, hand, shoulder |
MATERNAL WEIGHT GAIN DURING PREGNANCY |
The last recorded maternal weight prior to birth minus the last recorded weight immediately prior to pregnancy |
Weights used for the calculation should be from the best available information |
NON-CESAREAN UTERINE SURGERY OR SURGICAL SCAR |
Surgery or injury and healing of the myometrium prior to birth other than from cesarean birth |
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NON-CESAREAN UTERINE SURGERY OR SURGICAL SCAR |
Surgery or injury and healing of the myometrium prior to birth other than from cesarean birth |
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NULLIPAROUS |
A woman with a parity of zero |
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NUMBER OF CENTIMETERS DILATED ON ADMISSION |
The last documented cervical dilation in centimeters when the provider orders admission |
Cervical dilation may be unknown with:
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PARITY |
The number of pregnancies reaching 20 weeks and 0 days of gestation or beyond, regardless of the number of fetuses or outcomes |
In cases of multiple pregnancies, parity is only increased with birth of the last fetus |
PERINEAL LACERATIONS |
First degree: injury to perineal skin only Second degree: injury to perineum involving perineal muscles but not involving anal sphincter Third degree: injury to perineum involving anal sphincter complex Fourth degree: injury to perineum involving anal sphincter complex (external anal sphincter and internal anal sphincter) and anal epithelium |
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PHYSIOLOGIC CHILDBIRTH |
Spontaneous labor and birth at term without the use of pharmacologic or mechanical interventions for labor stimulation or pain management throughout labor and birth
Still applies if any of the following are used:
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PLACENTA ACCRETA |
The clinical condition in which any part of the placenta invades and is inseparable from the uterine wall |
Accreta may or may not be supported by pathologic findings. |
PLURALITY |
The number of fetuses birthed live or dead at any time in a single pregnancy regardless of gestational age and regardless of if the fetuses were birthed on different dates
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POSITIVE GBS RISK STATUS |
Rectal or vaginal culture positive within five weeks prior to birth, or urine GBS culture positive* or GBS bacteruria at any point in current pregnancy, or prior infant with invasive GBS disease |
*As defined by the CDC |
PREGESTATIONAL DIABETES |
Diabetes diagnosed before current pregnancy (coordinate with GDM) |
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RUPTURE OF MEMBRANES-RELATED DEFINITIONS |
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ARTIFICIAL RUPTURE OF MEMBRANES |
An intervention that perforates the amniotic sac |
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DURATION OF RUPTURED MEMBRANES |
Duration from rupture of membranes to birth (in hours and minutes) |
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PRELABOR RUPTURE OF MEMBRANES |
Spontaneous rupture of membranes that occurs before the onset of labor |
Modified by gestational age categories (eg, preterm, term) |
SPONTANEOUS RUPTURE OF MEMBRANES |
A rupture of the amniotic sac that is not concurrent with or immediately following a digital exam or other transvaginal intervention involving the amniotic membrane
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May occur at any gestational age |
SHOULDER DYSTOCIA |
A birth complication that requires additional maneuvers to relieve impaction of the fetal shoulder |
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SPONTANEOUS VAGINAL BIRTH |
Birth of the fetus through the vagina without the application of vacuum or forceps or any other instrument Does not apply if the following occurs:
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TERM-RELATED DEFINITIONS |
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PRETERM |
Less than 37 weeks and 0 days Late preterm is 34 weeks and 0 days through 36 weeks and 6 days |
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TERM |
Greater than or equal to 37 weeks and 0 days using best EDD. It is divided into the following categories:
Early-term: 37 weeks and 0 days through 38 weeks and 6 days |
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VACUUM ASSISTANCE |
Application of vacuum to the fetal head |
Should specify whether successful or unsuccessful in achieving birth; this includes both cesarean and vaginal births |
VERTEX PRESENTATION |
A fetal presentation where the head is presenting first in the pelvic inlet Does not apply if compound or breech presentation or if brow, face, hand, shoulder, etc. present first in the pelvic inlet |
Should specify whether position is anterior, posterior, or transverse |