Which of the following is NOT a common maternal test for stillbirth?

A thorough physical examination is fundamental in assessing any patient and plays a crucial role during pregnancy. However, when it comes to specifically investigating stillbirth, it is not considered a common test used to determine the underlying causes. The focus on maternal testing typically includes laboratory evaluations that can identify specific risk factors or underlying conditions that may contribute to stillbirth.

Anticardiolipin antibodies, lupus anticoagulant, and the indirect Coombs test are all laboratory tests that help assess for various immunological or hematological conditions affecting pregnancy. These tests are linked to conditions such as antiphospholipid syndrome, which can increase the risk for stillbirth. In contrast, while a thorough physical examination is essential for overall evaluation and care, it does not directly provide diagnostic information pertinent to the causes of stillbirth. Therefore, it stands out as the option that is not commonly employed specifically for this purpose.