Laboratory Tests and Nutrient Supplements

The selection of supplements depends on the presence of anemia, as determined by analysis of hemoglobin or hematocrit, and the presence of risk factors, as determined by a history that includes diet and by physical examination. Begin routine iron supplementation for all pregnant women by the 12th week of gestation.

The taking of vitamin/mineral supplements does not lessen the need for the consumption of a nutritionally balanced diet, nor should it be used to replace nutrition education and counseling. Women should be cautioned about taking self-prescribed vitamins, minerals, or other supplements because of the potential of such supplements for producing nutrient imbalances, excesses, or toxicities.

TABLE 1. Cutoff Values for Anemia for Womena

Pregnancy Status

Hemoglobin (g/dl)

Hematocrit (%)

Nonpregnant

12.0

36

Pregnant

Trimester 1

11.0

33

Trimester 2

10.5

32

Trimester 3

11.0

33

a From CDC.11 See Tab 9, Table 3, for corrections for high altitude.

TABLE 2. Cutoff Values for Anemia for Women Who Smoke Cigarettesa,b

Cigarettes per day

10-20

21-40

Pregnancy status

Hgbc (g/dl)

Hctd (%)

Hgb (g/dl)

Hct (%)

Nonpregnant

12.3

37

12.5

37.5

Pregnant

Trimester 1

11.3

34

11.5

34.5

Trimester 2

10.8

33

11.0

33.5

Trimester 3

11.3

34

11.5

34.5

a From CDC.11

b No adjustment is necessary for women who smoke less than 10 cigarettes daily.

c Hgb = hemoglobin.

d Hct = hematocrit.



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