When is research needed?
There is one and very specific indication: fever in a person returning from an endemic region - countries of Africa, Southeast Asia, India, Latin America. Malaria develops 1–4 weeks after a mosquito bite, and the tropical form can lead to death within a few days, so examination if suspected is carried out immediately. The thick drop method allows you to view a larger volume of blood than a conventional smear and detect parasites at low levels of parasitemia. Blood is taken at the time of fever; if the result is negative and suspicion remains, the test is repeated after 8–12 hours.
Why preparation is so important
The laboratory result is a number, but the correct number can only be obtained if the rules are followed. Eating changes the levels of glucose, lipids and a number of enzymes significantly; physical activity the day before increases CK and AST; smoking affects hormones; time of day is critical for cortisol and testosterone.
Therefore, a “bad analysis” often turns out to be a consequence of impaired preparation, and not an illness, and leads to unnecessary examinations and prescriptions.
General rules for donating blood
- on an empty stomach 8–12 hours, you can drink water
- Eliminate alcohol and intense exercise per day
- no smoking in an hour
- donate blood before physiotherapy, x-rays and massage
- Take medications in advance by agreeing with your doctor
- for hormones in women, take into account the day of the cycle
How to read the result
Reference values depend on the method and equipment of the laboratory, so it is correct to compare results only within the same laboratory. A deviation of a few percent from the normal limit in itself rarely matters - the overall picture and dynamics are important. It is up to the physician to interpret the analysis: an isolated indicator without a clinical context is often misleading.