Normal values depend on the type of substance your health care provider is screening for. In some people, a positive result may be normal.
What abnormal results mean:
Abnormal values depend on the type of substance your health care provider is screening for. In some people, a positive result may be normal.
Review Date: 10/27/2005
Reviewed By: Frank A. Greco, M.D., Ph.D., Director, Biophysical Laboratory, The LaheyClinic, Burlington, MA. Review provided by VeriMed Healthcare Network.
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