Not very: It is famously neither sensitive nor specific, but is one piece of information out of many.
Answered 7/15/2016
1.1k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
5 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question