Final answer:
Dehydration and scar tissue are two factors that may contribute to a difficult blood draw.
Step-by-step explanation:
Two factors that may contribute to a difficult blood draw are:
- Dehydration: When a person is dehydrated, it can make their veins smaller and harder to access.
- Scar tissue: If a person has had multiple blood draws in the past or surgeries that required frequent needle insertions, scar tissue can form, making it more difficult to find a suitable vein.