Final answer:
The nurse should report the Rubella titer 1:100 to the provider as it indicates potential insufficient immunity to rubella, which can be detrimental to the fetus. Other lab results are within normal ranges.
Step-by-step explanation:
Among the laboratory findings provided, the one that the nurse should report to the provider is d) Rubella titer 1:100. A rubella titer of 1:100 suggests that the patient might not have sufficient immunity against rubella, which is a cause for concern in pregnant women because the disease can cause serious congenital defects in the developing fetus. The other values provided, such as haemoglobin of 12.8 g/dL, a blood glucose reading of 90 mg/dL, and a platelet count of 250,000/mm³, are within normal ranges for a pregnant woman at 10 weeks of gestation. Hemoglobin levels are expected to be lower in pregnancy due to increased plasma volume; a normal blood glucose level for a fasting individual should be less than 100 mg/dL; and a normal platelet count ranges between 150,000 to 450,000/mm³ during pregnancy.