False Positive - Is there a hyphen in false positive?

Using a hyphen is the standard practice when the prefix ends in "a" or "i" and the term begins with that letter, as in intra-arterial or anti-immune, respectively. The same holds true for the use of suffixes such as -type, -elect, and -designate. "We performed a double-blind test; the test was double-blind," as an example. The findings of the test were found to be false positives, and these results were recorded.