Interleukin-6 is a commonly used inflammation marker.
Tips
memory
白介素 is a calque, not a transliteration: 白 (white) + 介 (interface / between) + 素 (substance) = "white-cell go-between substance" — a precise translation of "inter-leuk-in" (between + white blood cell). Numbered like the English: 白介素-1, 白介素-2, 白介素-6, etc.
usage
Also written 白细胞介素 (báixìbāo jièsù) in fuller form. Both are standard in medical Chinese; 白介素 is the everyday short version, often abbreviated IL- in mixed-language scientific writing.