Vitamins A and E
vitamin A test · retinol · vitamin E test · tocopherol · fat-soluble vitamins
This blood test shows whether your body has enough vitamins A and E.
For conditions where fat is poorly absorbed: bowel, liver, or pancreas problems, or after stomach surgery. Also for poor vision at dusk and dry skin.
⏱ Duration: the blood draw takes a few minutes; results usually come in 1 to 2 weeks
Be sure to tell your doctor
How to prepare
- Food. Usually on an empty stomach: 8 to 12 hours without food. It is especially important not to eat fatty food the day before. Water is fine.
- Vitamins. Ask your doctor if you should pause your vitamins before the test.
- The day before. For 24 hours: no alcohol and no hard workouts. Try not to smoke in the morning.
- Clothing. A sleeve you can easily roll up above the elbow.
What to bring
- Your referral or list of tests
- Your ID
- A list of your vitamins and supplements
How it goes
- You sit down and rest your arm on the armrest
- A band is tied above your elbow, and you are asked to clench your fist a few times
- The skin is wiped with antiseptic
- A quick prick. Blood fills the tubes in a few seconds
- The needle comes out, and a cotton pad is pressed on the spot
- The tube is shielded from light, because light breaks down these vitamins
What you'll feel
- A quick prick, like a pinch
- Sometimes slight dizziness. Tell the nurse, and they will help you lie down
Afterwards
- Press the cotton pad for 3 to 5 minutes
- You can eat right away
- Do not take large doses of vitamins on your own. Too much is harmful too
Contact a doctor straight away if
- The puncture site is very swollen, painful, and red
Common questions
Why do results take so long?
These vitamins are measured on special equipment that not every lab has. You will be told the timing when you give blood.
Can I take vitamins to prevent problems without a test?
Normal doses in multivitamins, if your doctor agrees. Large doses of vitamin A without a test are dangerous.