Administering a prophylactic dose of 4 g of cefazolin produced blood and tissue cefazolin concentrations that were significantly higher than concentrations obtained from a 2-g dose in patients with BMIs between 35 and 60 kg/m(2) undergoing cesarean delivery. It is unclear if the larger cefazolin dose produces a more protective anti-infective effect than that obtained with the more traditional 2-g dose for cesarean delivery in obese patients.

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