Welcome fikgirl!
Okay, lets take it from the top:
1. stabbed with what:
knife
knife, pencil, sword, ice pick, toasting fork, etc.
2. stabbed where:
A: clean area--chest=heart, lungs, liver
B: dirty area--stomach, intestines, bladder, kidneys--any perforations here and waste matter gets out for a secondary infection
C: head--face, eyes, cheeks, neck
D: limbs--clipping the femoral artery inside the thigh--as thick as your thumb, and you'll bleed out in 2-3 minutes.
I don't know. That's what I'm asking, mostly. I want the character to bleed a lot, need medical attention and pass out. He needs to be "on his back" for a few days afterwards
What era is your character in, what type of weapon is his opponent likely to use?
Modern, 20th century
How long does the fight last? Quick means a fast chest stab may hit a rib and deflect worse injury. Prolonged means the wielder can strike multiple times and do serious damage.
It's a domestic fight. Girlfriend being hit by her boyfriend. My White Knight character jumped in to stop it. Boyfriend pulled a knife, took a stab (or two) then got pulled off and ran
How proficient is the stabber? Is s/he a pro? Drunk? On drugs? In a rage?
Drunk and abusive
What about the victim? Knows self-defense? Carries a weapon too?
Does know self-defense, not carrying a weapon
How does the fight play out? Both standing, one stands one sits, etc, makes a difference too.
See above
What's the victim wearing--depends on personal taste, weather, social class, job, etc. A heavy coat can take longer to stab through. Add an inner pocket with something to deflect or slow a blade and your victim is lucky.
light jacket, t-shirt, jeans, typical "college" attire
Unconsciousness can also come from the impact of a fall after an assault, or a choke hold from behind while being stabbed.
No falling.
If the victim is not quite human--were, alien, etc, the organs could regenerate faster or even be missing, in different places, etc.
Human through and through