blood test for cancer

[Rainie3142]

I had 1/2 of my colon removed last June and, even though there was no cancer my blood test showed that there was a really high chance of having a pre-cancer or a cancer in my body.  I can't remember the name of the test except it may be something like .... C-26(?)  I am going to have the test re-done.  I have had a Pap Smear, Mammogram, Cat Scan of my chest and belly, and another Colonoscopy which showed no sign of cancer.  My doctor told me if the blood test is hight again then he wants me to have a full body Cat Scan.  I am very confused about this whole process.  Can anyone shed some light on this for me.
Thank you so very much.  Blessings.

[Barb135]

Do you have a thyroid disorder or is this a general cancer question?

A PET scan can tell if there is cancer anywhere in your body.  

MedHelp has a separate cancer forum, which can be accessed via the following link:

http://www.medhelp.org/forums/Cancer/show/59

[Red_Star]

Carcinoembryonic Antigen (CEA) and CA 19-9 are tumour markers expressed by colorectal cancers, particularly in advanced cases.

Excerpt from Vitamin D, Sunlight and Cancer Connection – Holick Jan 2013...

"It has been more than 100 years when it was first appreciated that increased sun exposure reduced risk of dying of cancer. The most beneficial effect of sun exposure is the production of vitamin D in the skin. Recent evidence suggests that most cells in the body not only have a vitamin D receptor but also have the capacity to convert 25-hydroxyvitamin D to 1,25-dihydroxyvitamin D.

Once formed 1,25-dihydroxyvitamin D can inhibit cellular proliferation, induce cellular maturation, inhibit angiogenesis and ultimately cause apoptosis to prevent malignancy. A multitude of studies have associated improved vitamin D status with decreased risk for developing several deadly cancers including colon, breast, pancreatic and ovarian cancers.

Patients with cancer are at high risk for vitamin D deficiency. Sensible sun exposure, vitamin D fortification and vitamin D supplementation should be encouraged to improve the vitamin D status of children and adults not only for bone health but for reducing risk of developing and dying of cancer.

The goal is to achieve a blood level of 25-hydroxyvitamin D of 40-60 ng/mL. This can be accomplished by children taking 600-1000 and adults 1500-2000 international units (IU) vitamin D daily from diet and supplements along with sensible sun exposure when the sun is capable of producing vitamin D in the skin."