What is the typical range for fetal hematocrit (Hct)?

The typical range for fetal hematocrit (Hct) is between 51% and 56%. During fetal development, the hematocrit levels are significantly higher than those observed in adults. This elevated level is necessary due to the increased metabolic demands of the fetus, which requires more oxygen to sustain growth and development. Hematocrit reflects the proportion of blood volume that is occupied by red blood cells, and higher hematocrit values in fetuses are essential for efficient oxygen transport in the relatively low-oxygen environment of the womb.

The values provided in the other choices do not accurately reflect the normal fetal range. Adult hematocrit levels, which typically fall between 40-45% for women and slightly higher for men, demonstrate how fetal requirements significantly differ from postnatal or maternal values. Thus, while hematocrit is a vital measure in assessing fetal well-being, understanding its normative values is crucial for practitioners in fetal monitoring.