Protocol - Serial Pregnancy Weight - Weights Abstracted from Prenatal Charts
Serial measures of weight either (1) abstracted from health care (prenatal) records or (2) measured prospectively for the duration of gestation. Data collected entail (1) weights measured at all prenatal visits; (2) dates of all prenatal visits; (3) reported pre-pregnancy weight; (4) reported or measured height; and (5) gestational age at every prenatal visit and at delivery. If the opportunity exists to collect the gestational weight prospectively as part of the research protocol, this is preferred because weights taken using a research protocol are better standardized for amount of participant clothing and scales are regularly calibrated.
Weights Abstracted from Prenatal and/or Labor and Delivery Charts
Most obstetric practices and prenatal clinics use a standardized form to chart prenatal course. The American Congress of Obstetricians and Gynecologists (ACOG, formerly the American College of Obstetricians and Gynecologists) has an Antenatal Record form that is periodically upgraded and available for its members. There are others, such as the POPRAS (Problem-Oriented Perinatal Risk Assessment System) or Hollister Maternal/Newborn Record System forms, which are also in common use. All of the standardized forms have places or spaces to report information on gestational age, pre-pregnancy weight, height, and weights measured during pregnancy at every prenatal visit and dates of examination, and these can be abstracted. For charts with only nurse/physician notes, measured weight should be recorded for each prenatal visit. For women carrying a singleton fetus, the expected schedule of prenatal visits suggested by ACOG is monthly through the 7th month (28 weeks), every 2-3 weeks through the 9th month (36 weeks), and weekly thereafter until delivery. Weight is occasionally measured at delivery and can be found in the labor and delivery chart along with the gestational age at delivery.
An example of the relevant section of the ACOG Antenatal Record Form B (Initial Physical Exam) which charts date of exam, pre-pregnancy weight, and height:
An example of the relevant section of the ACOG Antenatal Record Form C which contains the date of the woman’s last menstrual period (LMP) and estimated due date(s) (EDD) for establishing (or correcting) gestational age at each prenatal visit:
Gestational age (written with both weeks and days, e.g., 39 weeks and 0 days or 39 + 0) is calculated using the best obstetrical EDD based on the following formula:
Gestational Age = (280 - (EDD - Reference Date))/ 7
Personnel and Training Required
For the aspects of the measures requiring chart review, the abstracter should be trained in medical terminology and records review; for measuring weights, the examiner should be trained as for Measured Weight.
Paper-and-pencil (for chart review) and/or digital scale or beam balance scale.
|Specialized requirements for biospecimen collection||No|
|Average time of greater than 15 minutes in an unaffected individual||No|
Mode of Administration
Medical record abstraction
Women who have had a pregnancy (20 weeks or longer) or are currently pregnant.
Weight and weight gain in pregnancy are associated with adverse pregnancy outcomes, including risk for low and high birth weight (i.e., small-for-gestational age [SGA] and large-for-gestational age [LGA] newborns); risk for preeclampsia and gestational diabetes; and risk for cesarean delivery. Maternal weight gain below recommended is associated with a lower birth weight. Maternal weight gain in excess of recommendations is associated with a high birth weight and, especially among those women who were normal weight before pregnancy, has also been independently associated with risk of overweight and obesity in the offspring.
|caDSR Common Data Elements (CDE)||Person Prenatal Chart Serial Pregnancy Weight Gain Weight Value||5021302||CDE Browser|
Total Weight Gain in Pregnancy, Rates of Weight Gain
Process and Review
The Expert Review Panel #1 reviewed the measures in the Anthropometrics, Diabetes, Physical Activity and Physical Fitness, and Nutrition and Dietary Supplements domains.
Guidance from the ERP includes:
Added a new measure
- New Data Dictionary
Protocol Name from Source
American Congress of Obstetricians and Gynecologists (ACOG) Antenatal Form B and C
American Congress of Obstetricians and Gynecologists (http://www.acog.org/)
Institute of Medicine, Committee to Reexamine IOM Pregnancy Weight Guidelines. (2009). Weight gain during pregnancy: Reexamining the guidelines. K. M. Rasmussen & A. L. Yaktine (Eds.). Washington, DC: National Academy Press.
Rasmussen, K. M., Catalano, P. M., & Yaktine, A. L. (2009). New guidelines for weight gain during pregnancy: What obstetrician/gynecologists should know. Current Opinion in Obstetrics and Gynecology, 21, 521-526.
|Variable Name||Variable ID||Variable Description||dbGaP Mapping|
|PX021701100100||What is the date of the tenth prenatal more||N/A|
|PX021701020100||What is the date of the second prenatal more||N/A|
|PX021701030100||What is the date of the third prenatal more||N/A|
|PX021701040100||What is the date of the fourth prenatal more||N/A|
|PX021701050100||What is the date of the fifth prenatal more||N/A|
|PX021701060100||What is the date of the sixth prenatal more||N/A|
|PX021701070100||What is the date of the seventh prenatal more||N/A|
|PX021701080100||What is the date of the eighth prenatal more||N/A|
|PX021701090100||What is the date of the ninth prenatal more||N/A|
|PX021701100200||What is the patient's gestational age at the more||N/A|
|PX021701020200||What is the patient's gestational age at the more||N/A|
|PX021701030200||What is the patient's gestational age at the more||N/A|
|PX021701040200||What is the patient's gestational age at the more||N/A|
|PX021701050200||What is the patient's gestational age at the more||N/A|
|PX021701060200||What is the patient's gestational age at the more||N/A|
|PX021701070200||What is the patient's gestational age at the more||N/A|
|PX021701080200||What is the patient's gestational age at the more||N/A|
|PX021701090200||What is the patient's gestational age at the more||N/A|
|PX021701100300||What is the patient's height at the tenth more||N/A|
|PX021701020300||What is the patient's height at the second more||N/A|
|PX021701030300||What is the patient's height at the third more||N/A|
|PX021701040300||What is the patient's height at the fourth more||N/A|
|PX021701050300||What is the patient's height at the fifth more||N/A|
|PX021701060300||What is the patient's height at the sixth more||N/A|
|PX021701070300||What is the patient's height at the seventh more||N/A|
|PX021701080300||What is the patient's height at the eighth more||N/A|
|PX021701090300||What is the patient's height at the ninth more||N/A|
|PX021701010100||What is the date of initial examination||N/A|
|PX021701010200||What is the patient's height measured at more||Variable Mapping|
|PX021701010300||What is the patient's weight measured at more||Variable Mapping|
|PX021701100400||What is the patient's weight at the tenth more||N/A|
|PX021701020400||What is the patient's weight at the second more||N/A|
|PX021701030400||What is the patient's weight at the third more||N/A|
|PX021701040400||What is the patient's weight at the fourth more||N/A|
|PX021701050400||What is the patient's weight at the fifth more||N/A|
|PX021701060400||What is the patient's weight at the sixth more||N/A|
|PX021701070400||What is the patient's weight at the seventh more||N/A|
|PX021701080400||What is the patient's weight at the eighth more||N/A|
|PX021701090400||What is the patient's weight at the ninth more||N/A|
Serial Pregnancy Weight Gain
October 1, 2015
Serial changes in weight of the participant during the course of pregnancy for the most recent pregnancy.
Serial weights are used to assess patterns of weight gain over various periods, such as trimesters, and rates of weight gain, especially in the last two trimesters. Rates of weight gain are the only weight gain measures that are not dependent on a recalled or self-reported pre-pregnancy weight. Gestational weight gain and rates are generally interpreted based on a woman’s pre-pregnancy body mass index (BMI, kg/m2).
Anthropometrics, weight, body mass index, BMI, gestation, ACOG