What is the preferred sitting time for cholesterol testing?

• A. 1 minute
• B. 5 minutes
• C. 10 minutes
• D. 15 minutes

Answer: (B)

Cholesterol testing is influenced by pre-analytic factors, including how the patient sits and rests before the blood sample is taken. Having the patient sit quietly for about 5 minutes before drawing the sample helps the cardiovascular system settle, reduces postural and hemodynamic changes that can affect the concentration of lipids in plasma, and standardizes the conditions under which the test is performed. This brief resting period minimizes variability and gives a more stable, representative lipid measurement, which is why five minutes is the recommended sitting time. Shorter times may not allow stabilization, while longer rests aren’t typically needed for routine lipid testing and can be impractical.