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Protocol - Serial Pregnancy Weight - Weights Abstracted from Prenatal Charts

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Protocol Name from Source:

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

Availability:

Publicly available

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 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.

Protocol:

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:

[img[021701_Serial_Pregnancy_Weight_Gain_1.jpg|]]

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:

[img[021701_Serial_Pregnancy_Weight_Gain_2.jpg|]]

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 [link[www.phenxtoolkit.org/index.php?pageLink=browse.protocoldetails&id=21501|Measured Weight]].

Equipment Needs

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

Requirements

Requirement CategoryRequired
Average time of greater than 15 minutes in an unaffected individualNo
Major equipmentNo
Specialized requirements for biospecimen collectionNo
Specialized trainingNo

Mode of Administration

Self-administered

Life Stage:

Pregnancy

Specific Instructions:

None

Research Domain Information

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).

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 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.

Language

English

Standards

StandardNameIDSource
Common Data Elements (CDE)Person Prenatal Chart Serial Pregnancy Weight Gain Weight Value5021302CDE Browser

Process and Review

The [link[phenx.org/node/62|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

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:

21701

Variables:

Export Variables
Variable NameVariable IDVariable DescriptionVersiondbGaP Mapping
PX021701_SerialWeights_Prenatal_InitialExamination_DatePX021701010100What is the date of initial examination4N/A
PX021701_SerialWeights_Prenatal_InitialExamination_HeightPX021701010200What is the patient's height measured at initial examination?4N/A
PX021701_SerialWeights_Prenatal_InitialExamination_WeightPX021701010300What is the patient's weight measured at initial examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_2PX021701020100What is the date of the second prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_2PX021701020200What is the patient's gestational age at the second prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_2PX021701020300What is the patient's height at the second prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_2PX021701020400What is the patient's weight at the second prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_3PX021701030100What is the date of the third prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_3PX021701030200What is the patient's gestational age at the third prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_3PX021701030300What is the patient's height at the third prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_3PX021701030400What is the patient's weight at the third prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_4PX021701040100What is the date of the fourth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_4PX021701040200What is the patient's gestational age at the fourth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_4PX021701040300What is the patient's height at the fourth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_4PX021701040400What is the patient's weight at the fourth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_5PX021701050100What is the date of the fifth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_5PX021701050200What is the patient's gestational age at the fifth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_5PX021701050300What is the patient's height at the fifth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_5PX021701050400What is the patient's weight at the fifth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_6PX021701060100What is the date of the sixth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_6PX021701060200What is the patient's gestational age at the sixth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_6PX021701060300What is the patient's height at the sixth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_6PX021701060400What is the patient's weight at the sixth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_7PX021701070100What is the date of the seventh prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_7PX021701070200What is the patient's gestational age at the seventh prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_7PX021701070300What is the patient's height at the seventh prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_7PX021701070400What is the patient's weight at the seventh prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_8PX021701080100What is the date of the eighth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_8PX021701080200What is the patient's gestational age at the eighth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_8PX021701080300What is the patient's height at the eighth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_8PX021701080400What is the patient's weight at the eighth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_9PX021701090100What is the date of the ninth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_9PX021701090200What is the patient's gestational age at the ninth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_9PX021701090300What is the patient's height at the ninth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_9PX021701090400What is the patient's weight at the ninth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Date_Visit_10PX021701100100What is the date of the tenth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_GestationalAge_Visit_10PX021701100200What is the patient's gestational age at the tenth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Height_Visit_10PX021701100300What is the patient's height at the tenth prenatal examination?4N/A
PX021701_SerialWeights_Prenatal_Weight_Visit_10PX021701100400What is the patient's weight at the tenth prenatal examination?4N/A