Final answer:
The most concerning lab finding is a 37 week pregnant woman with a hemoglobin level of 10.5 g/dL, which indicates anemia. Other options are within normal ranges for pregnancy.
Step-by-step explanation:
Among the lab findings presented, option D) A 37 week pregnant woman with 10.5 g/dL hemoglobin (Hgb) is most concerning. For a non-pregnant adult female, normal Hgb levels generally range from 12.1 to 15.1 g/dL. During pregnancy, it is expected for hemoglobin levels to drop somewhat due to an increase in plasma volume. However, when this level drops too low, it suggests anemia. According to World Health Organization guidelines, a hemoglobin level below 11.0 g/dL in the second and third trimester is indicative of anemia.
Considering the other options, option A) shows a normal Hgb for a woman 20 weeks into pregnancy, while options B) and C) present with hematocrit within normal ranges for the respective stages of pregnancy. Hematocrit levels usually range from 37 to 47 percent for females, and thus, the 38% and 47% are not as alarming as the Hgb level of 10.5 g/dL.