Is the cervical spine CT without dye a risky thing to do?

No. Theris xray exposure other than that it causes no other problems I wouldn't call it risky.
No. In general, ct is of minimal risk, although ct involves mild radiation, and pregnant women should avoid nonemergent ct.

Related Questions

Does it hurt to get a cervical spine CT with dye done?

Just the IV. An IV is placed to inject the dye, which is usually only mildly painful. If you are having a myelogram (quite rare to do) the contrast is injected into your spinal fluid, which can be more painful.

What is the definition or description of: cervical spine CT with dye?

Imaging study. It is an imaging study allowing he physician to see the bones of the spine, the nerves and spinal cord. It is used to make a diagnosis for herniated disc, or degenerative disc disease. It is commonly used when a patient can not get an mri.
CT myelogram. A myelogram ct of the cervical spine is a similar study as far as information provided to the physician as an mri. It is an invasive test and requires a lumbar puncture with dye (this is uncomfortable to the patient). I only use it for instances when patients already have hardware in place as metal can produce significant scatter artifact in mri.

Do I have to get some blood tests before doing a cervical spine CT with dye?

Maybe. Usually patients get a blood test for renal function (creatinine) before contrast (dye) administration, as contrast can damage the kidneys. Younger patients without history of kidney disease often are not tested ahead of time.
Check kidney functio. If you habe reason to blieve you have marginal kidney function it is best to avoid this test if your kidneys are bad.

Does a cervical spine CT include thyroid, pharnyx etc?

On the edge. Settings are for the spine. But other structures may be in the field of view. Accuracy is enhanced when the focus is specific.
Yes. While targeted for the bones and tissues surrounding the cervical spine, it does include the pharynx and thyroid.