Final answer:
The neonatal screening card should be dried in a horizontal position in a well-ventilated area away from sunlight and heat for at least 3 to 4 hours.
Step-by-step explanation:
After a neonatal blood spot has been collected, the neonatal screening card should be dried to ensure the quality and preservation of the sample for accurate screening results. It is important to place the card in a horizontal position in a well-ventilated area away from direct sunlight, heat sources, and any potential contamination. The card should be dried for a minimum of 3 to 4 hours before it is sent to the laboratory for analysis.