For a fasting cholesterol test it can be 9 to 12 hours.

Fast time for blood test. The fasting time may vary according to the exam to be performed, and fasting may not be necessary, or a fasting period of 4, 8 or 12 hours may be indicated. You may be asked to fast for eight to twelve hours prior to a renal function blood panel test so that kidney function isn’t impacted. Drinking coffee, tea or even water can affect blood test results.

What to know about fasting before your lab test. 1 fasting for a blood sugar test, which is included in the basic metabolic panel, is generally eight. Immediate dark positive pregnancy test at 4 weeks.

It is a routine physical test done to check the levels of electrolyte, blood sugar and fluid balance. Did someone {like your doctor, or the lab) tell you that you had to fast for 14 hours? Your doctor may recommend a certain time period for fasting;

During that time the person can only drink water. Wall high school hazing video twitter. For most tests, you will be told not to consume anything but water for eight hours leading up to the test.

What to know about fasting before your lab test.with certain blood tests, you may be instructed to fast for up to eight hours before your appointment.fasting before a blood draw means you. Blood tests can help analyze different how long to fast. Different types of blood tests require different fasting times.

It is suggested to not fast before a thyroid blood test, as it provides misleading results of increased tsh levels in the body. You are required to fast for up to 12 hours before going for a blood test. The blood draw process can be very quick if you have veins that are easily visualized and accessed.