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How to prepare for blood test

Recommendations for how to prepare for blood test:

– it is recommended not to eat 8-12 hours prior to a blood test. It is important to remember that juice, tea, and coffee, especially sweetened, are also considered food. One is only allowed to drink water;

– patient should not eat 3 hours prior to general blood test;

– 1-2 days prior to the test it is recommended to eat less fat and fried food, and avoid alcohol;

– do not smoke for one hour prior to the test;

– the levels of enzymes and hormones might vary at different times of day, therefore these tests should be performed before 10 a.m.;

– it is recommended to avoid physical load (sports) and stress before the blood test, to calm down and rest for at least 10-15 minutes;

– if you are planning to start using medications, perform tests before or after treatment, no sooner than 10-14 days post-treatment. When establishing the efficacy of a drug, blood is tested in 14-21 days after using the drug. If you are using medications, be sure to inform your doctor or laboratory specialist about it;

– it is not recommended to perform blood tests after roentgenelogic and ultrasound tests, massage, reflexotherapy or physiotherapy procedures;

– the results of women hormone tests are influenced by physiological factors related to the menstruation cycle, therefore, during preparation for a sex hormone test, it is necessary to indicate cycle phase and listen to doctor’s recommendations, on which cycle day to perform tests;

– before performing a stress hormone test (ACTH, cortisol, prolactine, etc.) it is important to calm down, ignore side factors during the procedure and relax because stress increases the level of these hormones in blood;

– when performing tests regarding infections, it is necessary to take into account the stage of infection development and the state of immunity. A negative test result does not necessarily show that there is no infection. If laboratory test results cause doubts, it is appropriate to repeat them in 3-5 days. It is best to perform infection tests 10-14 days after the onset of disease, when the antibody production is the most active.

Joint Commission International ligoninės standartas