STAT means now. Everything else means consult a specialist.
A needle-within-a-needle situation used in medicine, or basically any thin, pointy medical probe that makes you question your life choices. It's that rigid wire inside catheters and needles that keeps them from flopping around during insertion, then gets yanked out once positioned. Think of it as training wheels for invasive medical procedures.
Medical indication that a problem affects the whole body rather than one localized area, like a computer virus versus a broken key. It's why some infections require full-body warfare with IV antibiotics.