Checking creatinine after eating has a mild effect, but the effect is not very big, so you can also check. Creatinine is an indicator of kidney function, and elevated creatinine suggests kidney failure. Creatinine is mainly a product of muscle metabolism in the body, but some exogenous meat can also affect it, such as chicken, duck, lean pork and so on. Because these foods can also produce creatinine after eating and absorbing, also constitute part of blood creatinine, and the proportion is relatively small. But if the patient’s kidney function is normal, even if he eats more meat, creatinine will not rise too much, at least not more than the upper limit of normal value. Therefore, in the clinical suspicion of patients with renal function abnormalities, regardless of whether there is no meal, all renal function tests, mainly to consider eating for patients to check the blood creatinine effect is relatively small.