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Protocol - Serial Pregnancy Weight - Weights Measured During Gestation

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Description:

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 information prospectively as part of the research protocol, this is preferred.

Protocol:

Weights Measured during Gestation (Research Protocol)

Gestational ages, date of initial examination, and pre-pregnancy weight are abstracted from medical records (also described in the protocol, Weights Abstracted from Prenatal Charts). Weight in pregnancy is measured at prenatal or research visits using a research protocol (see Measured Weight). Height can be collected by self-report (see Self-reported Height) or, preferably, by measurement in the 1st trimester (see Standing Height).

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, and dates of examination, and these can be abstracted. 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. The gestational age at delivery can be found in the labor and delivery chart.

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

Protocol Name from Source:

American Congress of Obstetricians and Gynecologists (ACOG) Antenatal Form B and C

Availability:

Publicly available

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.

Equipment Needs

Paper-and-pencil (for chart review) and/or digital scale or beam balance scale.

Requirements
Requirement CategoryRequired
Major equipment No
Specialized training No
Specialized requirements for biospecimen collection No
Average time of greater than 15 minutes in an unaffected individual No
Mode of Administration

Physical measurement and/or medical record abstraction

Life Stage:

Pregnancy

Participants:

Women who have had a pregnancy (20 weeks or longer) or are currently pregnant.

Specific Instructions:

None

Selection Rationale

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 [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.

Language

English

Standards
StandardNameIDSource
Common Data Elements (CDE) Person Measured Serial Pregnancy Weight Gain Weight Value 5021307 CDE Browser
Derived Variables

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:

a. Added a new measure

b. New Data Dictionary

Source

American Congress of Obstetricians and Gynecologists (http://www.acog.org/).

General References

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.

Protocol ID:

21702

Variables:
Export Variables
Variable NameVariable IDVariable DescriptionVersiondbGaP Mapping
PX021702_SerialWeights_Prenatal_Date_Visit_1 PX021702020100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_10 PX021702110100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_2 PX021702030100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_3 PX021702040100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_4 PX021702050100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_5 PX021702060100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_6 PX021702070100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_7 PX021702080100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_8 PX021702090100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Date_Visit_9 PX021702100100 What is the date of today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_1 PX021702020200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_10 PX021702110200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_2 PX021702030200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_3 PX021702040200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_4 PX021702050200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_5 PX021702060200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_6 PX021702070200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_7 PX021702080200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_8 PX021702090200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_GestationalAge_Visit_9 PX021702100200 What is the patient's gestational age at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_1 PX021702020300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_10 PX021702110300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_2 PX021702030300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_3 PX021702040300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_4 PX021702050300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_5 PX021702060300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_6 PX021702070300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_7 PX021702080300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_8 PX021702090300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Height_Visit_9 PX021702100300 What is the patient's height at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_InitialExamination_Date PX021702010100 What is the date of initial examination 4 N/A
PX021702_SerialWeights_Prenatal_InitialExamination_Height PX021702010200 What is the patient's height measured at initial examination? 4 N/A
PX021702_SerialWeights_Prenatal_InitialExamination_Weight PX021702010300 What is the patient's weight measured at initial examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_1 PX021702020400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_10 PX021702110400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_2 PX021702030400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_3 PX021702040400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_4 PX021702050400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_5 PX021702060400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_6 PX021702070400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_7 PX021702080400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_8 PX021702090400 What is the patient's weight at today's prenatal examination? 4 N/A
PX021702_SerialWeights_Prenatal_Weight_Visit_9 PX021702100400 What is the patient's weight at today's prenatal examination? 4 N/A
Research Domain Information
Measure Name:

Serial Pregnancy Weight Gain

Release Date:

October 1, 2015

Definition

Serial changes in weight of the participant during the course of pregnancy for the most recent pregnancy.

Purpose

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).

Keywords

Anthropometrics, weight, body mass index, BMI, gestation, ACOG