Blood sample

A blood test is an examination of blood to identify normal and pathological conditions in the body. Blood may also be used to detect drugs or toxins.


Taking a blood sample is to deplete a small amount of blood to examine any changes in blood content. For most diseases, the blood that flows through all the body's organs and tissues, show a number of changes. This applies to the number of blood cells, and appearance - or - the concentration of various biochemical substances. With a simple analysis, we can get a good "mirror" of what happens in the body.


Preparations at home

Some analyzes are directly affected by the meals and / or diet. It is therefore important that you follow the guidelines of the person who referred the blood sample. Any questions about fasting or diet addresses to the referring physician.


Preparations at the hospital

The lab receives both inpatients and outpatients for sampling during office hours. Sampling of patients outside the hospital takes place preferably with your GP family doctor unless the sampling poses particular problems. You must bring with you a doctor's referral ff this is not already sent to the lab . You do not need an appointment for blood sampling at our polyclinics and the hospital requires no fee.


Whoever takes the test will ask for your name and 11-digit identity number to ensure proper identity labelling the samples. The sampler is well trained and will ensure that samples are taken in a gentle, effective and correct way.

When a blood sample is taken into a vein, one venous cannula (thin needle) tucks into a vein located just below the skin, often on the inside of the elbow. To hit the vein easily, tighten a band on the upper arm, and the blood vessel will stand a little stretched and are easier to see. The veins on the front of the elbow are suitable for blood; they are the right size and located near the skin surface. Veins on backside of hands and ankles can also be used, but for patients with low circulation and patients with diabetes, one should avoid taking blood samples at these locations.

Blood is drained out of vacuum that draws out the necessary amount of blood, often in several tubes. The recaps of the tubes have different colors. Each color shows what kind of fabric is added to prevent blood to dry. Usually 1-5 tubes of blood are drained, depending on how many analyzes your doctor wants carry out.

In most cases it may be problematic to take blood sample. It might be a little uncomfortable when sticking through the skin. Some may become unwell during sampling. If you know that this may hapen to you, it is smart to tell the sampler.

Local anesthetic cream can be applied to children or others who are very anxious. This should in any case be applied to the skin 1-2 hours prior to sampling (not functioning in fingers and heels).

The blood sampling usually takes a few minutes. It is taken usually in a seated position, and if possible, you should be seated at least 20 minutes in advance.

After the blood sample is taken, press cotton around the injection so it is not bleeding.


Results of the examination

The test answer will be reported to the GP  / department. It varies how long time it takes to analyze blood samples. Test results will be available online shortly after parsing. Some test results will be ready after a few minutes, others after a few hours, later the same day or next day. For some test results may take days before the answers are.

If the test result is sent in mail to doctors outside the hospital it may take a few days before the answer reaches you.

It is the GP who informs you about the test results. The laboratory is usually not allowed to communicate test results to you.

Contact information


Parking Øya

Transportation Øya

Bus - Local and the surrounding districts

The best way to plan your travel is to visite the website of AtB and use the "Reiseplanlegger" (planner):

Bus - Airport

Flybussen: http://www.flybussen.no/en 


Marienborg is the nearest train station to the hospital at Øya:

There is local bus service to and from the Trondheim Central Station:

Practical information


Note: Not all departments at St. Olav have the service to call you back, except for some outpatient clinics and laboratories.

What is callback?

Callback means that the telephone service is open to the public 24 hours so that you can give your message regardless of opening hours.

Remember personal identity number before calling

Please have your personal number - 6 or 11 figures - ready before calling. This will be of great help when we call you back.

If you are calling on behalf of others, for example children, the child's personal number must be entered.

Payment for not meeting

Note that cancellation must be made at least 24 hours before the appointment. Cancellation later than 24 hours before the appointment causes a fee of NOK 640 (in 2016)

Food. Places to eat

There are several places to eat in the hospital.

"Mat og cafe" of St. Olavs Hospital offers a variety of food in the centers at Øya, at Lian and in the local hospitals in Røros and Orkdal.

"SiT" on behalf of the NTNU, runs cafes at Øya helsehus and in the Medisnteksniske senter.

There are also a cafe in the Rusklinikken in Klostergata 48.

​Read more: Mat og cafe

Patient hotel


Opening hours:
  • Monday - Friday: 09:00 - 19:00
  • Saturday: 1000 - 1400

Phone 73 86 42 00

Read more about the Pharmacy


Shops within the Hospital area at Øya:

  • Bunnpris, located in Elgesetergate 18
  • Coop Prix in Klostergata 46


St. Olavs Hospital offers a free wireless guest network called HMNGuest. The guest network is available at all hospital locations throughout the region.

  • Connect to your wireless network HMNGuest
  • Open your browser and follow the instructions
  • You will receive a password by SMS and then you can use guest network online
  • Passwords are valid for one week at a time. Passwords can be sent to any mobile phone with a Norwegian mobil number

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