The prognosis is good for the red-hot “Grey’s Anatomy”: ABC has given the medical drama an early pickup for next year.

Midseason show launched strongly out of the gate, taking advantage of its stellar “Desperate Housewives” lead-in. “Anatomy” has averaged a 7.7 rating/ 19 share in adults 18-49, making it the top-rated new skein since January.

“Anatomy” has also attracted an average of 17.8 million viewers, making it the most-watched midseason drama since 1993, when “Dr. Quinn, Medicine Woman” launched on CBS.

Alphabet web greenlit 13 episodes of “Anatomy” for next fall; it’s ABC policy not to give a full 22-episode sophomore order right off the bat for a show that bowed in midseason, the net said.

Still, ABC will also have four leftover episodes from this year already in the can. (Because the show launched late in the season, the net will have aired only nine segs.)

Also, a full season pickup is likely if “Anatomy” continues to perform. Show’s surprisingly big launch persuaded ABC to hold off from bringing back “Boston Legal” in its Sunday night slot. (“Legal’s” extra episodes were held for next season.)

“Anatomy” joins previously announced early pickups for “According to Jim,” “Alias,” “America’s Funniest Home Videos,” “Boston Legal,” “Desperate Housewives,” “Extreme Makeover: Home Edition” and “Lost.”

Shonda Rhimes created and exec produces “Grey’s Anatomy,” which comes from Touchstone TV. Mark Gordon, Betsy Beers and Jim Parriott also exec produce.

Drama stars Ellen Pompeo, Patrick Dempsey, Sandra Oh, Isaiah Washington, Katherine Heigl, Justin Chambers, T.R. Knight, Chandra Wilson and James Pickens Jr.