Cancer of unknown primary origin laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: ; Roukoz A. Karam, M.D.[2]

Overview

There are no specific diagnostic laboratory findings associated with cancer on unknown primary origin; however, certain abnormal laboratory findings may help in locating the primary origin of the tumor.

Laboratory Findings

There are no specific diagnostic laboratory findings associated with cancer on unknown primary origin; however, certain abnormal laboratory findings may help in locating the primary origin of the tumor.

• CBC
  • Iron deficiency may be a sign of gastric or colorectal cancer causing blood loss
• Urinalysis
  • Hematuria may point towards bladder cancer
• Liver function tests
• Fecal occult blood test
• PSA