Tips to fast safely before a test
08 February 2023
Although a standard blood test doesn’t need you to fast, there are still some specialised tests which do. Here is a simple guide to fasting for an upcoming test
What is fasting?
Fasting means that you must not have anything to eat, drink or chew after 9 pm the night before a test – Drinking plain water is allowed.
Drinking plain water will help you to stay hydrated and may also help suppress appetite. Avoid drinking coffee, juice, tea and alcohol.
Tests which require fasting
- C-Peptide (CPE)
- Calcium/Creatinine Ration (urine test)
- Chromogranin – A
- Folate (serum)
- Glucose Tolerance Test (GTT)
- Homocysteine (HCY)
- Hydrogen H2 Breath Test (Lactose intolerance)
- Iron Studies
- Pancreatic Polypeptide
- Urea Breath Test
- Vasoactive Intestinal Peptide (VIP)
You do not need to fast for a venesection procedure.
Make sure you check with your doctor regarding medications that you are taking. Do not change or stop your medication unless they request it.
If you are still unsure about what is required for your test, contact us on 08 8222 3000 or e-mail Health.SAPathologyCallCentre@sa.gov.au.
As the leading Clinical Scientist of public health and epide...
The Last of Us - Mycology in the limelight
If you’ve binged the first season of the hit TV show The Las...
David Cox – A rising star in Genetics and Molecular Pathology
Born and bred in the sunshine state, David Cox constantly so...
Hitting the brakes on asthma
A shared focus on antibody therapies has underpinned the hig...
Test Spotlight - Renin and Aldosterone
Aldosterone is a hormone produced by the adrenal glands, whi...