The correct answer is choice C) Elevated serum bilirubin levels. This is because bilirubin is a product of hemolysis (the breakdown of red blood cells), which is one of the components of HELLP syndrome. Elevated serum bilirubin levels indicate that there is excessive hemolysis occurring in the body, which can lead to jaundice and liver damage.

Choice A) Elevated serum creatinine levels is wrong because creatinine is a marker of kidney function, not liver function or hemolysis. While kidney failure can occur as a complication of HELLP syndrome, it is not a diagnostic criterion.

Choice B) Elevated serum uric acid levels is wrong because uric acid is also a marker of kidney function, not liver function or hemolysis. Uric acid levels can be elevated in preeclampsia, but not specifically in HELLP syndrome.

Choice D) Elevated serum glucose levels is wrong because glucose is not related to liver function or hemolysis. Glucose levels can be elevated in gestational diabetes, but not in HELLP syndrome.

Normal ranges for these tests are:

• Serum bilirubin: 0.3 to 1.2 mg/dL

• Serum creatinine: 0.6 to 1.1 mg/dL

• Serum uric acid: 2.4 to 6.0 mg/dL

• Serum glucose: 70 to 100 mg/dL