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Venous draw instructions

How to prepare for a venous blood draw


Your test kit should include the following items

  • 1 x Needle
  • 1 x Register your Kit QR code
  • Collection vial(s)
  • 1 x Clear sample returns bag with absorbent pad
  • 1 x Plaster
  • 1 x Alcohol swab
  • 1 x Cleansing wipe 
  • Vial labels(s)
  • 1 x Returns envelope with label
  • 1 x Lab requisition form
  • 1 x Anti-tamper seal



It is advised to take and post the test earlier in the week (Mon-Wed is ideal) to ensure the sample is as fresh as possible for the lab.


Register your kit online

Before you return your kit, it is important to register it to your Omnos account.If your kit is not registered our lab will be unable to process your sample.
Visit https://app.omnos.me/register

In order to get the most accurate results you should fast for 8 hours in advance of taking the test. The easiest time to do this is in the morning, having fasted overnight.

You should also avoid caffeine for 12 hours and alcohol for 36 hours in advance of the test.

Make sure you're hydrated 
Drink at least 500ml of plain water 1-2 hours prior to taking the test and 2-3l extra the day before the test as hydration can affect your results and how well blood will flow. 

Stay warm
Make sure to keep warm prior to your blood test as this will help to speed up the procedure.

On day of taking the test 
When you attend the clinic you must take your Omnos test kit with you (including the lab requisition form containing your unique Barcode ID) as the clinic will not provide this. 

Depending on the clinic provider you may also be required to take photographic ID to confirm you are the person who made the booking.

Please ensure the components in your test kit are kept sealed prior to the appointment to 
ensure they are sterile.


If you have purchased a kit-only option please contact your preferred phlebotomist or clinic to arrange a blood draw.

If you have purchased the pre-paid phlebotomy service using one of our partner clinics please refer to your Omnos Order email for clinic details and how to book your appointment.


Once your sample has been processed you will receive an email confirming your results are ready to be viewed on your account. This is usually within 3-5 days of the lab receiving the sample. 

If there are any issues with your sample we will be in touch.


Q. Do I need to stop taking medicines /supplements to take the blood test?
A. For the most accurate results you should refrain from taking any supplements 48 hrs prior to taking the test.

If you are on prescription medication we do not make any recommendation other than to check with your own doctor.