The NBA and National Basketball Players Association are close to an agreement to test the blood of players for human growth hormone, according to sources.

Testing for HGH could begin as soon as the 13-14 NBA season.

NBA players are currently subject to six urine tests a year, two of which occur in the offseason.

Staff attorney Ron Klempner is directing the union on an interim basis. Sources insist HGH testing can proceed regardless, and the union can and will implement HGH tests before resolving its leadership issues.

David Stern expressed optimism at the All-Star Game that HGH testing would soon be agreed upon.