What type of ancillary service might include a blood test?

The choice indicating lab services is correct because these services are specifically designed for the analysis and processing of biological samples obtained from patients, such as blood tests, urine tests, and other biological specimens. Lab services encompass a wide range of diagnostic tests that help in identifying, diagnosing, and monitoring various health conditions. Blood tests, in particular, are one of the most common procedures performed in a laboratory setting, providing critical information about a patient's health.

Imaging services primarily involve techniques such as X-rays, MRIs, and CT scans, which create images of the body to help diagnose conditions but do not include blood testing. Supportive healthcare services refer to ancillary services that assist in patient care but do not specifically relate to diagnostic testing like lab services do. Consultation services involve patient evaluations and advice, typically provided by a healthcare professional, but do not encompass any laboratory testing procedures either. Therefore, lab services are the most appropriate answer for this question regarding ancillary services that include blood testing.