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Protocol - Gestational Age - Maternal Interview

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Description:

Twelve questions about whether the woman was trying to get pregnant or had infertility treatment; dates for the last menstrual cycle, first prenatal visit and first ultrasound, and estimates of the delivery date.

Specific Instructions:

Accuracy of gestational age (GA) is essential to the validity of numerous pregnancy and birth outcomes. This interview should be completed at initial stages of data collection/patient contact. The interview should be completed at or after the time of delivery in order to determine the gestational age at delivery. Objective determination (Gestational Age - Medical Record Abstraction) is preferred to maternal recall given inherent risk of bias in the latter. Although these items are from a study of extremely low gestational age newborns, the PhenX Pregnancy Work Group members recommend it for use with any newborn.

Protocol:

Now I’d like your help to accurately determine your baby’s gestational age.

1. Were you trying to get pregnant when you did?

[ ] 0 No

[ ] 1 Yes

2. Were you regularly using any form of birth control when you got pregnant?

[ ] 0 No

[ ] 1 Yes

3. If NO: For how many months were you having sex without using any birth control? __ __ __

4. Did you have any kind of infertility therapy to get pregnant this time?

[ ] 0 No

[ ] 1 Yes

5. If YES: Were you treated with:

a. Intrauterine insemination (IUI)

[ ] 0 No

[ ] 1 Yes

b. A fertility drug such as Clomiphene (Clomid) or Perganol

[ ] 0 No

[ ] 1 Yes

c. A procedure such as IVF or ICSI

[ ] 0 No

[ ] 1 Yes

6. IF Q5b is YES: What drugs were you treated with?

[ ] 1. Clomid, Serophene (Clomiphene)

[ ] 2. Gonal-F, Follistim

[ ] 3. Pergonal, Repronex, Humogon

[ ] 4. Fertinex

[ ] 5. Pregnyl, Profasi, Novarelle, Ovidrel

[ ] 6. Lupron

[ ] 7. Progesterone, Utrogestan, Prometrium, Crinone

[ ] 8. Other

7. IF Q5c is YES: What fertility procedure was used?

[ ] 1 IVF (in vitro fertilization). Fertilization takes place in a Petri dish and the embryo transferred to the uterus.

[ ] 2 IVF+ assisted hatching. Same as 1 except the layer of cells covering the egg (zona pellucida) is removed permitting easier and earlier cell division in the embryo.

[ ] 3 GIFT (gamete intra fallopian transfer). Sperm and egg are injected into the fallopian tube where fertilization takes place.

[ ] 4 ZIFT (zygote intra fallopian transfer). Fertilization takes place in a Petri dish and the embryo transferred to the fallopian tube.

[ ] 5 ICSI (intra cytoplasmic sperm injection). Sperm are injected into the cytoplasm of the egg and the resulting embryo transferred to the uterus.

[ ] 6 ICSI + assisted hatching. Same as 5 except the zona pellucida is removed.

8. What was your transfer date (mmm/dd/yyyy)? __ __ __/__ __/ 20 __ __

All dates are entered in a standard mmm/dd/yyyyy format. The ’mmm’ is for the first three characters of the month (jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec). You need not capitalize. The ’dd’ is for the two digits that represent the day in the month. The ’yyyyy’ part is the four digits that represent the year.

9. What was your retrieval date (mmm/dd/yyyy)? __ __ __/__ __/ 20 __ __

10. How many eggs were retrieved? __ __

11. When did your last entirely normal period begin (mmm/dd/yyyy)? __ __ __/__ __/ 20 __ __

If the woman is uncertain about what and/or when was the last menstrual period, repeat the question slowly and allow her to make her own decision about it. If she answers ’Well, I thought it was one date but my doctor thought it was another,’ let the woman know that you want what she thought was the first day of her LMP. We will get the doctor’s perception from the medical record.

12. When did you first go to a doctor or clinic for prenatal care (mmm/dd/yyyy or week of pregnancy)? __ __ __/__ __/ 20 __ __

Please enter the date (mmm/dd/yyyy) the woman first visited a doctor or clinic for prenatal care. For the women who had fertility therapy, the date of the first prenatal care visit is the date when the pregnancy was confirmed. If a woman has any trouble with this question, again, repeat it slowly and emphasize the underlined word. If she can’t recall the exact date of her first prenatal visit ask her the week of pregnancy in which she first saw the doctor. If the woman did not receive services specifically for pregnancy care, enter 0 for week in pregnancy.

13. What due date were you given then (mmm/dd/yyyy)? __ __ __/__ __/ 20 __ __

14. When was your first ultrasound performed? (mmm/dd/yyyy or week of pregnancy) __ __ __/__ __/ 20 __ __

15. Did the ultrasound give the same due date as your doctor or nurse?

[ ] 0 No

[ ] 1 Yes

16. If NO: What date did the ultrasound give (mmm/dd/yyyy)? __ __ __/__ __/ 2 0 __ __

17. Did anyone ever change your due date?

[ ] 0 No

[ ] 1 Yes

18. If YES: Why?

[ ] 1 baby was too small

[ ] 2 baby was too big

[ ] 3 other

19. What was the final due date (mmm/dd/yyyy)? __ __ __/__ __/ 20 __ __

Use the "last" due date. If the due date was changed following the sonogram, use that due date. If it was not changed, then use the initial due date.

Then calculate the days before or after the due date that the baby was actually born. The formula is

Gestational age at birth = 280 + (date of birth-due date).

So if a baby was born before the due date then the gestational age will be <280, and if it was born after the due date it will be >280. 280 days from the first day of the LMP is the ‘idealized length’ of human pregnancy.

Protocol Name from Source:

Extremely Low Gestational Age Newborns (ELGAN) Study, Maternal Interview

Availability:

Publicly available

Personnel and Training Required

The interviewer must be trained to conduct personal interviews with individuals from the general population. The interviewer must be trained and found to be competent (i.e., tested by an expert) at the completion of personal interviews. The interviewer should be trained to prompt respondents further if a "don’t know" response is provided.

Equipment Needs

None

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

Interviewer-administered questionnaire

Life Stage:

Adult, Pregnancy

Participants:

Pregnant women

Selection Rationale

This protocol is from the well-established Extremely Low Gestational Age Newborns (ELGAN) Research Study which is a large scale multicenter epidemiologic study.

Language

English

Standards
StandardNameIDSource
Common Data Elements (CDE) Pregnancy Gestational Age Assessment Questionnaire Assessment Text 5633779 CDE Browser
Derived Variables

None

Process and Review

The Expert Review Panel has not reviewed this measure yet.

Source

Boston Medical Center, Extremely Low Gestational Age Newborns (ELGAN) Study, 2002 Maternal Interview, Items 25-43

General References

McElrath, T. F., Hecht, J. L., Dammann, O., Boggess, K., Onderdonk, A., Markenson, G., Harper, M., Delapapa, E., Leviton, A. (2008). Pregnancy disorders that lead to delivery before the 28th week of gestation: An epidemiologic approach to classification. American Journal of Epidemiology, 168(9), 980-989.

O’Shea, T. M., Allred, E. N., Dammann, O., Hirtz, D., Kuban, K. C., Paneth, N., & Leviton, A. (2009). The ELGAN study of the brain and related disorders in extremely low gestational age newborns. Early Human Development, 85(11), 719-725.

Protocol ID:

240901

Variables:
Export Variables
Variable NameVariable IDVariable DescriptionVersiondbGaP Mapping
PX240901_Gestational_Age_Change_Due_Date PX240901170000 Did anyone ever change your due date? N/A
PX240901_Gestational_Age_Change_Due_Date_Reason PX240901180000 If YES: Why? N/A
PX240901_Gestational_Age_Due_Date PX240901130000 What due date were you given then (mmm-dd-yyyy)? N/A
PX240901_Gestational_Age_Eggs_Retrieved PX240901100000 How many eggs were retrieved? N/A
PX240901_Gestational_Age_Fertility_Drug PX240901050200 If YES: Were you treated with: A fertility drug such as Clomiphene (Clomid) or Perganol N/A
PX240901_Gestational_Age_Fertility_Drug_Details PX240901060000 IF Q5b is YES: What drugs were you treated with? N/A
PX240901_Gestational_Age_Fertility_Procedure PX240901070000 IF Q5c is YES: What fertility procedure was used? N/A
PX240901_Gestational_Age_Final_Due_Date PX240901190000 What was the final due date (mmm-dd-yyyy)? N/A
PX240901_Gestational_Age_First_Prenatal_Date PX240901120100 When did you first go to a doctor or clinic for prenatal care (mmm-dd-yyyy)? N/A
PX240901_Gestational_Age_First_Prenatal_Weeks PX240901120200 When did you first go to a doctor or clinic for prenatal care (week of pregnancy)? N/A
PX240901_Gestational_Age_First_Ultrasound_Date PX240901140100 When was your first ultrasound performed? (mmm-dd-yyyy) N/A
PX240901_Gestational_Age_First_Ultrasound_Weeks PX240901140200 When was your first ultrasound performed? week of pregnancy N/A
PX240901_Gestational_Age_Infertility_Therapy PX240901040000 Did you have any kind of infertility therapy to get pregnant this time? N/A
PX240901_Gestational_Age_Intrauterine_Insemination PX240901050100 If YES: Were you treated with: Intrauterine insemination (IUI) N/A
PX240901_Gestational_Age_IVF_ICSI PX240901050300 If YES: Were you treated with: A procedure such as IVF or ICSI N/A
PX240901_Gestational_Age_Last_Normal_Period PX240901110000 When did your last entirely normal period begin (mmm-dd-yyyy)? N/A
PX240901_Gestational_Age_Regular_Birth_Control PX240901020000 Were you regularly using any form of birth control when you got pregnant? N/A
PX240901_Gestational_Age_Retrieval_Date PX240901090000 What was your retrieval date (mmm-dd-yyyy)? N/A
PX240901_Gestational_Age_Transfer_Date PX240901080000 What was your transfer date (mmm-dd-yyyy)? N/A
PX240901_Gestational_Age_Trying_Pregnant PX240901010000 Were you trying to get pregnant when you did? N/A
PX240901_Gestational_Age_Ultrasound_Doctor PX240901150000 Did the ultrasound give the same due date as your doctor or nurse? N/A
PX240901_Gestational_Age_Ultrasound_Due_Date PX240901160000 If NO: What date did the ultrasound give (mmm-dd-yyyy)? N/A
PX240901_Gestational_Age_Without_Birth_Control PX240901030000 If NO: For how many months were you having sex without using any birth control? N/A
Pregnancy
Measure Name:

Gestational Age

Release Date:

January 31, 2017

Definition

The period of time in weeks and days from the first day of the last menstrual period to the estimated date of delivery.

Purpose

Gestational age is an essential component of research on pregnancy outcomes. It is often used in research for stratification purposes, influences interpretation of many related measures, and is inversely associated with many neonatal complications.

Keywords

Pregnancy, prenatal, birthweight, due date, estimated due date, EDD, fertility, Extremely Low Gestational Age Newborns, ELGAN