Final answer:
Spirocerca lupi can be diagnosed through direct observation of the organism in CSF or through RT-PCR assays that detect genetic markers of T. gondii.
Step-by-step explanation:
Spirocerca lupi can be diagnosed through a variety of tests. Blood tests, fecal examinations, urine tests, and X-rays are not commonly used to diagnose Spirocerca lupi. The most accurate method of diagnosis is by direct observation of the organism in CSF or through RT-PCR assays that can detect genetic markers of T. gondii.