Which of the following is typically used to assess levels of liver function in patients with suspected acute fatty liver of pregnancy?

Prothrombin time (PT) and partial thromboplastin time (PTT) are critical tests used to evaluate liver function, especially in conditions such as acute fatty liver of pregnancy. These tests measure how long it takes for blood to clot, which is heavily influenced by the liver's ability to produce clotting factors.

In cases of acute fatty liver of pregnancy, liver function may be compromised due to the accumulation of fat in liver cells, which can lead to impaired synthesis of these clotting factors. An increased PT or PTT can indicate liver dysfunction and potential coagulopathy, making these tests particularly relevant for assessing the severity of liver involvement in this condition.

Other options, such as serum glucose levels or a complete blood count (CBC), do not directly reflect liver function and would not provide the necessary information regarding the liver's ability to synthesize clotting factors. Similarly, a chest X-ray is unrelated to liver function assessment. Hence, PT and PTT are indeed the appropriate indicators for evaluating liver function in patients suspected to have acute fatty liver of pregnancy.