Body Mass Index and Pregnancy: Establishing a “ Term BMI ”
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Body Mass Index and Pregnancy: Body Mass Index and Pregnancy: Establishing a Establishing a “ “ Term BMI Term BMI ” ” Diana Garretto, MD & Erin Stevens, MD State University of New York at Stony Brook University Medical Center Department of Obstetrics, Gynecology, & Reproductive Medicine The IOM recommends a 28-40 lb weight gain for underweight pregnant patients, a 25-35 lb gain for normal weight, 15-25 lb gain for overweight and a 11-20 gain for obese. In non- pregnant populations, underweight is a BMI <18.5, normal weight is a BMI 18.5- 24.9, overweight is a BMI 25- 29.9 and obese is a BMI >30. The BMI at term was calculated based on the weight gain recommendations for underweight, normal weight, overweight and obese patients. BMI is calculated using the formula BMI = kg/m 2 . The BMI calculator at the NIH website was used to perform the calculations. Heights of 5’0’, 5’5’, and 5’10’ were used as representative heights. Individuals at 5’ were assigned the lower limit of the weight gain and 5’10’ Objective Tables Conclusions Study Design To use the 2009 recommendations by the Institute of Medicine (IOM) on weight gain during pregnancy to calculate what the appropriate BMI at term would be. Results A patient would be considered underweight if the BMI at term was <23.5, normal weight if the BMI at term was 23.5- 29.9, overweight if the BMI at term was 30-33.5 and obese if the BMI at term was >33.5. A standard BMI at term can be easily calculated and applied to obstetric practice. Using the “Term BMI” at the time of delivery may be an easier way to objectively assess risks of obesity at term than weight alone. PrePregnancy PrePregnancy BMI BMI BMI (kg/m2) BMI (kg/m2) (WHO (WHO criteria) criteria) Total Weight Total Weight Gain Range Gain Range (lbs) (lbs) Rates of Rates of weight gain weight gain 2 nd nd and 3 and 3 rd rd trimester trimester (mean range (mean range in lbs/wk) in lbs/wk) Underweight <18.5 28-40 1 (1-1.3) Normal Weight 18.5-24.9 25-35 1 (0.8-1) Overweight 25-29.9 15-25 0.6 (0.5-0.7) Obese (includes all >=30 11-20 0.5 (0.4-0.6) Pre-Pregnancy BMI Pre-Pregnancy BMI Weight Gain Weight Gain Term BMI Term BMI 5’ 0” 103 lbs BMI = 20 25 lbs 5’ 0” 128 lbs BMI = 25 5’ 5” 120 lbs BMI = 20 30 lbs 5’ 5” 150 lbs BMI = 25 5’ 10” 140 lbs BMI = 20 34 lbs 5’ 10” 174 lbs BMI = 25 Validation of the “term BMI” in regards to mode of delivery, diabetes, estimated blood loss, preeclampsia via a retrospective chart review is currently underway. Future Research
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Body Mass Index and Pregnancy: Establishing a “ Term BMI ”. Diana Garretto, MD & Erin Stevens, MD State University of New York at Stony Brook University Medical Center Department of Obstetrics, Gynecology, & Reproductive Medicine. Results. Tables. Objective. - PowerPoint PPT Presentation
Transcript of Body Mass Index and Pregnancy: Establishing a “ Term BMI ”
Body Mass Index and Pregnancy: Body Mass Index and Pregnancy:
Establishing a Establishing a ““Term BMITerm BMI””Diana Garretto, MD & Erin Stevens, MD State University of New York at Stony Brook University Medical CenterDepartment of Obstetrics, Gynecology, & Reproductive Medicine
The IOM recommends a 28-40 lb weight gain for underweight pregnant patients, a 25-35 lb gain for normal weight, 15-25 lb gain for overweight and a 11-20 gain for obese. In non-pregnant populations, underweight is a BMI <18.5, normal weight is a BMI 18.5-24.9, overweight is a BMI 25-29.9 and obese is a BMI >30. The BMI at term was calculated based on the weight gain recommendations for underweight, normal weight, overweight and obese patients. BMI is calculated using the formula BMI = kg/m2. The BMI calculator at the NIH website was used to perform the calculations. Heights of 5’0’, 5’5’, and 5’10’ were used as representative heights. Individuals at 5’ were assigned the lower limit of the weight gain and 5’10’ the upper limit.
Objective Tables
ConclusionsStudy Design
To use the 2009 recommendations by the Institute of Medicine (IOM) on weight gain during pregnancy to calculate what the appropriate BMI at term would be.
Results
A patient would be considered underweight if the BMI at term was <23.5, normal weight if the BMI at term was 23.5-29.9, overweight if the BMI at term was 30-33.5 and obese if the BMI at term was >33.5.
A standard BMI at term can be easily calculated and applied to obstetric practice. Using the “Term BMI” at the time of delivery may be an easier way to objectively assess risks of obesity at term than weight alone.
PrePregnancy PrePregnancy BMIBMI
BMI (kg/m2)BMI (kg/m2)(WHO (WHO criteria)criteria)
Total Weight Total Weight Gain Range Gain Range (lbs)(lbs)
Rates of Rates of weight gain weight gain 22ndnd and 3 and 3rdrd trimester trimester (mean range (mean range in lbs/wk)in lbs/wk)
Underweight <18.5 28-40 1 (1-1.3)Normal Weight 18.5-24.9 25-35 1 (0.8-1)Overweight 25-29.9 15-25 0.6 (0.5-0.7)Obese (includes all classes)
>=30 11-20 0.5 (0.4-0.6)
Pre-Pregnancy BMIPre-Pregnancy BMI Weight GainWeight Gain Term BMITerm BMI
5’ 0”103 lbs
BMI = 2025 lbs
5’ 0”128 lbs
BMI = 25
5’ 5”120 lbs
BMI = 2030 lbs
5’ 5”150 lbs
BMI = 25
5’ 10”140 lbs
BMI = 2034 lbs
5’ 10”174 lbs
BMI = 25
Validation of the “term BMI” in regards to mode of delivery, diabetes, estimated blood loss, preeclampsia via a retrospective chart review is currently underway.
Future Research
