Patient preparation for medical laboratory test

When you get sick and go to a medical facility your doctor usually  wants you to have some medical laboratory tests. Blood test and urine test (urinalysis) (See. Urinalysis) are the most common tests. With your test results and your doctors examination your illness’ reason will be understood and the treatment will start.

Some of the laboratory tests (See. Laboratory tests)  are useful for diagnosing and some of them  show us how  well treatment process is working, and if treatment is  successful. Today with the progression of technology, having laboratory tests is very easy and resulting them takes less time.

What are the important topics we must know before test preparation

blood tests-Don’t forget the instructions of your doctor about the laboratory test you  will have, for exp. fasting time for glucose test.

– Alert your doctor, nurse or technician about if you couldn’t follow the instructions or deviated them, for exp if you are not fasting  at less 8-10 hours you should not have glucose test.

-Inform your doctor about the medications you use before your laboratory test, some medications would affect test results.

– Let your doctor know about your behaviours, which  can affect  your test results, for exp. exercising  the day before, drinking  alcohol etc.


Fasting is the mostly known rule before having a laboratory  test. This rule can be forgotten to remind  sometimes  by the  doctors who order tests from patients. You can eat and drink as normal before some kind of blood tests.

If you are instructed to be fasted before having laboratory  tests;  you must be at least 8-10 hours fasting so lots of substance in foods,  will not affect  your test results. If you didn’t fast before having  laboratory test, this will cause inaccurate results for  your fasting blood sugar test. Your laboratory test result will be found higher than expected, this will cause  a  wrong diagnose.

medical laboratory tests

Giving blood sample without fasting affects results of tests,  at the same time the   serum fluid (which gained from blood) will be blurred. Blur will affect the results too and one of the reasons of fasting before laboratory tests is to prevent blur.

Fasting is not necessary for all the tests, for exp. if you will have hemogram (complete blood count) test you don’t need to fast. For this reason please ask to your doctor if fasting is necessary or not for your tests.

Using medicines before laboratory tests

medical laboratory testMost of the people don’t know if  it is necessary or not to stop medication before having a laboratory  test. It depends on the type of the test and the kind of medication you use. If you are not sure to use or to stop taking your medicines, please consult with to your doctor. Sometimes it can be a medicine level determining test and if you use your medicine just before the test  your result will be found higher and your doctor will reduce your medical dose incorrectly.

Time of giving blood for tests

Patients think that every hour of day is suitable for having medical laboratory  tests but it is not true. Levels of some body chemicals  varies hour by hour during day. Because of different blood collection times the results can be different from each other and the diagnose may be inaccurate. For this reason laboratory tests must be  performed usually at morning, in this way the waiting time for fasting will match to your sleeping time. So the test results will be analysed correctly.



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