After breakfast, blood will then be drawn to check the serum biochemistry 29 items. The results of the biochemistry test will be seriously affected due to the digestion and absorption of food ingredients. Serum biochemistry 29 items, clinically known as the large biochemistry test, usually include liver function, renal function, electrolytes, blood glucose, blood lipids, cardiac enzyme profiles and other items in the test program. Taking blood tests after breakfast may have a huge impact on liver function, kidney function, blood sugar, blood lipids and many other tests. For example, after breakfast, blood glucose concentration and blood lipid concentration will increase as food is digested and absorbed. If the food contains a large amount of meat, it will also cause an increase in creatinine values. Before performing the serum macrobiotics test, please maintain a fasting period of at least 8 hours. Patients should strictly follow the doctor’s instructions, complete the preparations before the test, and minimize the interference of food and exercise on the test results to ensure the accuracy of the test.