Not only the laboratory but also your preparation is crucial for the reliability of your tests. Even the wrong cup of coffee, lack of sleep, or intense training can alter the values. Here are the most common mistakes and 12 rules to consider before the test:

1. Go on an empty stomach

Most chemistry tests require fasting. An 8–12-hour fast is ideal. You can drink water, but do not consume coffee, tea, or fruit juice.

2. Drink Plenty of Water

Dehydration (thirst) can interfere with kidney function tests. Drink enough water the morning of the test.

3. Avoid Caffeine and Cigarettes

Coffee, tea, energy drinks, and cigarettes affect some hormone and blood sugar levels. Avoid them at least 12 hours before the test.

4. Don't Drink Alcohol

Alcohol increases liver enzymes and raises triglycerides. Avoid consuming alcohol for at least 48 hours before the test.

5. Avoid Heavy Exercise

Intense exercise increases muscle enzymes and certain hormones. Avoid strenuous exercise 24 hours before the test.

6. Get Good Sleep

Inadequate sleep affects blood sugar and stress hormones. Get at least 7–8 hours of sleep before the test.

7. Use the Same Lab

It is very important to measure your values with the same devices and methods for trend tracking.

8. Report Medications and Supplements

Never stop taking your regular medications or vitamins yourself. Be sure to notify the laboratory.

9. Prefer Early Morning Hours

Hormonal values (cortisol, testosterone, TSH) fluctuate throughout the day. For the most accurate results, take your test between 7:00 AM and 10:00 AM.

10. Don't Stress

Experiencing intense stress while waiting can affect cortisol and blood pressure. Try to stay relaxed.

11. Write Down Your Routines

Take notes on your sleep, nutrition, and exercise habits over the past few days. This information is valuable for the doctor or specialist preparing the report.

12. Cycle Tracking for Women

Make note of which day of your menstrual cycle you are on. Some hormone tests are more accurate based on the day of your cycle.

Summary: Correct Preparation = Correct Result

Tests depend not only on the accuracy of laboratory equipment but also on your preparation. Small details make a big difference.

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Legal Note

This content is for educational purposes only. It does not constitute diagnosis or treatment. Consult your physician for personal health decisions.