Prenatal Record - National Archives and Records Administration

OB-2
Reproductive History
Form OB-2 was used to record information about the previous pregnancies of
each gravida. Data were obtained through interviews with the gravida herself.
Used first in January of 1959, the form was revised once in January of 1961.
Revisions did not affect items or order of items on the form. Card numbers
from the master file and the number of records generated for each of these
cards appear in Table OB-2.1. An 0302 card indicates the gravida had four or
fewer prior pregnancies; for women with more than four prior pregnancies,
cards 1302, 2302, etc., were used as required.
TABLE OB-2.1
Cards and Data Records by Revision for Form OB-2
Card Rev. Number
Card Name Number No. Records
OB-2: Four or Fewer Prior Pregnancies 0302 0 47,655
OB-2: More Than Four Prior Pregnancies with 1302 0 9,020
First Through Fourth Recorded
OB-2: Fifth Through Eighth Prior Pregnancies 2302 0 9,040
OB-2: Ninth Through Twelfth Prior Pregnancies 3302 0 1,417
OB-2: Thirteenth Through Sixteenth Prior 4302 0 159
Pregnancies
OB-2: Seventeenth Through Twentieth Prior 5302 0 15
Pregnancies
OB-2: Twenty-first Through Twenty-fourth 6302 0 2
Prior Pregnancies
OB-2: Twenty-fifth Through Twenty-sixth 7302 0 1
Prior Pregnancies
total for form 67,309
Reproduced at the National Archives
II.A.21
OB-2