Which of the following does NOT cause a rightward shift in the oxygen dissociation curve?

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Decrease in blood pHElevation in body temperatureHigher levels of 2,3-DPGPresence of fetal hemoglobin (HbF)Increased carbon dioxide concentration

Explanation

A rightward shift in the oxygen dissociation curve occurs with factors such as decreased pH, increased temperature, and elevated 2,3-DPG, which facilitate oxygen release to tissues. However, fetal hemoglobin (HbF) shifts the curve to the left, indicating higher oxygen affinity and less oxygen release.