Nine days ago I bought 10 organic chickens which were on sale. After deboning them and freezing the breasts and thighs I simmered the carcasses to make some stock. Unfortunatly I forgot to transfer the stock from the fridge to the freezer the next day. I rarely use the fridge in my basement and found out today that I left the stock out... It still smells like chicken stock but I'm not sure if I should be using it? (even after boiling)
I had some in my fridge for a couple weeks- it smelled fine, then I used it and I'm ok! :) I admit I was a little nervous! Mine had a layer of fat covering the top; I'm not sure how true it is, but I've read the layer of fat helps to keep bacteria from growing in the broth. Works for me!
If it's gone bad you would know it the INSTANT you opened the container. Do a spoon taste-test to confirm, but if it doesn't smell wretched (as spoiled chicken stock would) you are ok. But use it soon - it will be turning quickly.
I'm pretty sure the official advice would be no. We are after all chronically germ-averse. Personally, I am not well organised or wasteful enough for that and so tend to trust (and work on improving) my own senses. It might kill me one day I suppose.
Keep it. Use it. Especially if there's a layer of fat on the top. The fat will protect the broth from bacteria. It's like pouring wax over canned preserves. And the fat itself doesn't need to be protected. My parents used to leave a crock full of bacon fat on their counter. Never refrigerated it. They used it to cook food and even buttered their bread with it. So I think your chicken fat is safe too.
Did you just leave it in the fridge, or actually leave it out? Fridge- fine for your own consumption no doubt, but i'd probably not serve it to company, just in case. If you left it totally out- just pitch it.