This is on a master bathroom sink in a 1 1/2 story home and the drain will gurgle about 3-5 seconds after the faucet is shut off. Reading posts it sounds like this is a blocked vent?
There is no second level above this bath. The vent line goes into the attic space and ties into the main vent and out the roof. So, I'm trying to figure out how this could be a blockage? BTW, none of the other fixtures cause the gurgle and none of the other drains gurgle.

Thanks for any help.

KCDAVE,: Take your trap under the sink apart and clean it out ,its probley partly stopped up with hair & scum; this is a normal condition that happens to all of us . P,S. IF I have helped rate this answer;;;below

Blue Eagle describes a clog in the drain. This sounds like a vent problem. To snake the bathroom vent you'll hafta go up in the attic and cut the bathroom vent where it revents into the roof vent. Put out enough cable to reach the base and 20 feet more to catch the drain as well. Afterwards, couple the bathroom vent back into the roof vent and give yourself a pat on the back. You have just saved yourself a hefty service bill. Good luck, Tom