Blood Leakage Detector

Dear everyone!

I'm in a bio-medical graduation project. My topic is to make a blood leakage detector. I searched for sensors and i thought about using photo transistor (LPT 110) and arduino uno to sense the leakage of blood and if leakage occurred, a buzzer will give me an alarm.

Is there anyone who can help me to make this circuit and to write the code??

Thanks in advance.

Before you get to the circuit and code, how do you envisage this idea working?