Judgement is made on the basis of the nature of the effusion.
If the discharge is a blood clot, it may be a bleeding from the vagina or uterus that has not been drained in time and needs to be diagnosed in conjunction with ancillary tests etc. If the discharge is grape-like blister-like tissue, it may be a staph; if the discharge is pregnancy tissue, it may be an embryonic discharge and can be classified as a miscarriage; if the discharge is cauliflower-like tissue, it may be a malignant tumour.