Final answer:
The serum beta-HCG test can reveal a positive result a few days after implantation. The HCG hormone is detectable in the serum within a week after conception.
Step-by-step explanation:
The serum beta-HCG (Human chorionic gonadotropin) test can typically reveal a positive result a few days after implantation. Once the zygote (fertilized egg) implants into the wall of the uterus, the trophoblast cells release HCG, which can be detected in the bloodstream and urine. The HCG hormone is typically detectable in the serum within a week after conception, although it is recommended to confirm the results after 10-14 days for accuracy.