For example, measurements of kidney, liver, and thyroid function, as well as blood counts, are not influenced by fasting. However, fasting is required before commonly ordered tests for glucose (blood sugar) and triglycerides (part of the cholesterol, or lipid, panel) for accurate results.

Should liver function test be done empty stomach?

Most other blood tests, like hemoglobin levels, renal function, liver function, thyroid hormones, sodium and potassium levels don't need to be done on an empty stomach because they do not change before or after meals to any meaningful degree.

Can you eat or drink before a liver function test?

How Should I Prepare for a Liver Function Panel? You may be asked to stop eating and drinking for 8 to 12 hours before the test. Tell your doctor about any medicines you take because some drugs might affect the test results.