Blood tests alone usually cannot diagnose cancer
Abnormal blood counts may suggest a problem
Low red blood cells can indicate anemia
High or low white blood cells can be a warning sign
Low platelets can be associated with blood cancers
Abnormal liver function tests may suggest cancer spread or liver disease
High calcium levels can sometimes be linked to cancer
Elevated tumor markers may help detect or monitor some cancers
Common tumor markers include PSA, CA-125, CEA, AFP, and CA 19-9
Tumor markers are not specific for cancer
A doctor may order a complete blood count
A doctor may order blood chemistry tests
A doctor may order tumor marker tests
A doctor may order additional imaging or biopsy if results are suspicious
Persistent abnormal results should be evaluated by a doctor
Blood tests cannot confirm cancer without further testing