02/05/2026
Final Episode: Just One Biscuit? The Myths, The Excuses & The facts? Dr. Ewua- Gyan writes….
If you've followed this series from the beginning, thank you. Genuinely. You now understand your blood tests better than most people who have been getting them for years.
In this final episode, I want to address the things I hear most often from patients, from relatives of patients, and honestly, sometimes from other healthcare workers. These are the myths, the excuses, and the misunderstandings that keep landing people back in the waiting room for a repeat blood draw.
Myth 1: “I Only Had a Tiny Biscuit, That Can't Possibly Matter"
Oh, but it can.
Your body doesn't grade food by size. Even a small snack triggers a glucose response, a fat response, and a hormonal response. Your blood doesn't know it was "just one biscuit." It just knows food arrived and immediately starts processing it.
The fact: If a test requires fasting, even a small snack can compromise the result. Wait until after the draw, then eat everything in sight. You deserve it.
Myth 2: "My Tea Had No Sugar, So It's Fine"
I understand the logic, no sugar, no calories, no problem, right? Tea and coffee both stimulate a cortisol response and can raise blood glucose even without added sugar. They also contain compounds that can interfere with certain test parameters.
The fact: The only safe drink before a fasted blood test is plain water. Not tea. Not black coffee. Not juice. Water.
Myth 3: "I Fasted, But Only for 4 Hours"
Four hours feels like a long time when you're hungry. But your body doesn't finish processing a meal in four hours.
Depending on what you ate, it can take your blood 8 to 12 hours to fully return to a fasted baseline. The fat particles from a heavy evening meal can still be circulating in your bloodstream the next morning if you didn't fast long enough. That's what creates the milky serum we see in the lab.
The truth: 8 to 12 hours is the standard minimum. Go to bed, let your body rest, and schedule your test early in the morning.
Myth 4: "The Results Were Fine Last Time and I Ate Then Too"
This is a tricky one, because technically, you might have gotten away with it once. But here's what you don't know: you have no way of comparing what your fasted result would have looked like versus what was reported. The result may have appeared "normal" on paper while still being inaccurate compared to your true baseline.
The fact: Getting away with it once doesn't mean it was accurate. Your health decisions deserve reliable numbers.
From the perspective of a Biomedical Scientist-
I've spent this entire series bringing you behind the curtain, into the part of your healthcare that most people never see. The centrifuges. The milky samples. The rejected samples. The silent frustration of a lab scientist who just wants to give your doctor the most accurate information possible.
And it all comes down to this: you are part of the process. Your preparation before the test is just as important as the test itself.
Fasting is not punishment. It's preparation. It's how you give your body the best chance to tell the truth.
Thank you for reading every episode of this series. I hope it's changed how you think about your blood tests and made the next early morning fast at least a little more bearable.
Until the next series, stay curious, stay informed, and please, drink more water. 💧🔬
~ The Medpulse Insights.