Final answer:
The two factors that determine whether a child should have capillary collection by heel or stick are the child's age and the amount of blood needed for testing.
Step-by-step explanation:
When determining whether a child should have capillary collection by heel or stick, two main factors are taken into account: the age of the child and the amount of blood needed for testing or analysis.
For newborns, capillary collection by heel is often preferred because their blood vessels are generally more accessible in the heel. This method is commonly used for routine tests such as newborn screenings. On the other hand, for older children who require a larger amount of blood, capillary collection by finger stick may be more suitable.
It's important to consider the child's age and the specific testing requirements to determine the appropriate method of capillary collection.