Every morning, someone walks into the lab after a cup of tea and asks, “Just a little tea is fine, right?” Another person has skipped dinner completely because they were told to fast. Both mean well, but both can end up with a report that does not show the real picture.
Here are seven simple things to know before your blood test.
1. Not every test needs fasting
Tests like fasting blood sugar and lipid profile (cholesterol) are usually done on an empty stomach. Many others, such as a complete blood count (CBC), HbA1c and most thyroid tests, generally do not need fasting. If you are unsure, ask the lab or your doctor before you come.
2. Fasting usually means 8 to 12 hours
For most fasting tests, an overnight fast of 8 to 12 hours is enough. Eat a normal, light dinner and come to the lab the next morning. Fasting much longer than needed is not better and can make you feel weak.
3. Plain water is allowed
Drinking plain water is fine and actually helps, because it makes it easier to draw blood. Tea, coffee (even black), juice, milk and chewing gum are not allowed during the fast.
4. Do not stop medicines on your own
Do not skip regular medicines unless your doctor has told you to. If you take insulin or tablets for diabetes, talk to your doctor about timing, because fasting while on these medicines can cause low sugar.
5. Avoid alcohol and heavy exercise the day before
Alcohol, very oily food and intense exercise the previous day can affect results such as triglycerides and liver tests. A normal, quiet day before the test is best.
6. Post-meal sugar has its own timing
For a post-prandial (PP) sugar test, the sample is usually taken 2 hours after you start your meal. Eat your usual meal, note the time, and avoid snacking in between.
7. Morning home collection makes it easier
For elderly parents or anyone who feels unwell while fasting, a home sample collection early in the morning saves the travel and the waiting. They can eat soon after the sample is taken.
Need a test done? Medlab Diagnostics, Pearl Towers, Choondi offers home sample collection and online reports. Book on WhatsApp or call us, and our team will guide you on preparation before the visit.
This article is for general awareness only. Please follow your doctor’s advice for your own health condition.