In assessing a client at 34 weeks gestation, the nurse notes that she has a slightly elevated total T4 with a slightly enlarged thyroid, a hematocrit of 28% (0.28 volume fraction), a heart rate of 92 beats per minute, and a systolic murmur. Which finding requires follow-up? Reference Range: Hematocrit [37% to 47% (0.37 to 0.47 volume fraction)]