Fast National ratings for Tuesday, April 20, 2010.
 
With "American Idol" doing its usual Tuesday work and "Glee" retaining an impressive percentage of its lead-in, particularly in the young adult demos, FOX easily outdistanced the competition for the night.
 
Among adults 18-49, FOX averaged a 6.0 rating, nearly doubling the 3.2 rating for second place NBC. ABC was a close third in the coveted demographic with a 2.8 rating. CBS' 1.7 rating and the 0.4 rating for The CW followed.
 
Overall, FOX averaged an estimated 16.32 million viewers and a 9.3 rating/15 share. ABC and CBS both posted a 6.1/10 for second, with ABC holding the advantage in total viewers. NBC's 5.0/8 was good for fourth. The CW's 0.7/1 trailed.
 
"American Idol" controlled the 8 p.m. hour for FOX with 10.7/17, drawing 19.14 million viewers and a 6.7 demo rating, all numbers roughly comparable to last week's "Idol" audience for the hour. ABC's "Dancing with the Stars" was second overall with an 8.8/14. CBS' "NCIS" repeat had a 6.4/10 for third. Fourth place went to NBC's "The Biggest Loser," which had a 4.5/7 and actually finished second for the hour in the demo. The CW's repeat of "90210" trailed.
 
In the 9 p.m. hour, FOX's "Glee" did a 7.9/12 and a 5.3 demo rating. [Note that much to the chagrin of DVR users, "Idol" ran into the hour and impacted the first half-hour of the "Glee" ratings, while the show still held onto a 7.2/11 and a 5.0 demo rating in the 9:30 half-hour.] CBS' repeat of "NCIS: Los Angeles" was second for the hour. Both ABC's "Lost" and NBC's "The Biggest Loser" did a 5.8/9 for third, but the NBC reality show drew more viewers (9.56 to 9.35 million) and did a better demo number (3.8 rating to 3.6 rating). The CW's repeat of "Life Unexpected" was fifth with a 0.6/1.
 
In the 10 p.m. hour, CBS' repeat of "The Good Wife" did a 5.2/9 to win the hour overall. NBC's newly renewed "Parenthood" got a strong week-to-week bump and won the hour in the key demo with a 2.9 rating, delivering a 4.7/8 overall. ABC's "V" had a 3.9/7 with 6.03 million viewers, very slightly up from last week. 
 
 
All ratings information comes from preliminary Fast National Nielsen data, which includes live and same-day DVR viewing. All numbers are subject to change.