The normal range is 0 to 2.5 micrograms per liter (mcg/L). In smokers, the normal range is 0 to 5 mcg/L.
Normal value ranges may vary from lab to lab. In smokers, slightly higher values may be considered normal.
What abnormal results mean
Higher than normal levels may be due to:
- Cancers of the reproductive and urinary tracts
Cirrhosisand other liver disease
- Colon cancer
- Heavy smoking
- Inflammatory bowel diseases (such as
ulcerative colitis) Lung cancer Lung infection Pancreatic cancer Pancreatitis Peptic ulcer Thyroid cancer
Review Date: 08/01/2009
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.