For many people, the prospect of blood draws is one of the most anxiety-inducing parts of a clinical trial. Understanding why they are needed, and what to expect, can make a significant difference.
Why Are Blood Draws Required?
Blood tests serve multiple purposes in clinical research:
Safety monitoring, Routine blood chemistry panels (metabolic panel, complete blood count, liver enzymes) monitor for any adverse effects of the study treatment on organ function.
Eligibility confirmation, Certain lab values must fall within specified ranges for participants to remain eligible for the study.
Pharmacokinetics (PK), Some studies measure how the body processes the study drug by measuring drug levels in the blood at specific time points after dosing.
Biomarker analysis, Blood samples may be analyzed for biomarkers, biological indicators that reflect disease activity or treatment response.
How Many Blood Draws Can I Expect?
This varies widely by study. Some observational studies require no blood draws at all. Most Phase II-IV trials require blood draws at several visits, typically at screening, at baseline, and at periodic intervals throughout the study.
Tips for Making Blood Draws Easier
- Stay well hydrated in the days before and morning of your visit, this makes veins easier to find
- Inform your phlebotomist of any history of difficult draws
- Focus on slow, deep breathing during the draw
- Ask to be reclined if you feel lightheaded after draws
- Avoid excess physical activity the morning of a draw
NuLine’s certified phlebotomists are experienced and gentle. If you have concerns, let us know before your appointment. Contact us.