Document Detail

The length of uncomplicated human gestation.
MedLine Citation:
PMID:  2342739     Owner:  NLM     Status:  MEDLINE    
By retrospective exclusion of gestations with known obstetric complications, maternal diseases, or unreliable menstrual histories, we found that uncomplicated, spontaneous-labor pregnancy in private-care white mothers is longer than Naegele's rule predicts. For primiparas, the median duration of gestation from assumed ovulation to delivery was 274 days, significantly longer than the predicted 266 days (P = .0003). For multiparas, the median duration of pregnancy was 269 days, also significantly longer than the prediction (P = .019). Moreover, the median length of pregnancy in primiparas proved to be significantly longer than that for multiparas (P = .0032). Thus, this study suggests that when estimating a due date for private-care white patients, one should count back 3 months from the first day of the last menses, then add 15 days for primiparas or 10 days for multiparas, instead of using the common algorithm for Naegele's rule.
R Mittendorf; M A Williams; C S Berkey; P F Cotter
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  75     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  1990 Jun 
Date Detail:
Created Date:  1990-06-26     Completed Date:  1990-06-26     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  929-32     Citation Subset:  AIM; IM    
Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts.
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MeSH Terms
Private Practice
Retrospective Studies
Time Factors
Comment In:
Obstet Gynecol. 1990 Oct;76(4):732-4   [PMID:  2216213 ]

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