The final report regarding the risk of Down's syndrome and two other genetic chromosomal syndromes will be based not on a single value of
beta hcg but a combined value based on the mother's age, other parameters in history, double marker test values of papp-a and beta hcg and NT scan value. (Even if beta hcg is abnormal, the combined report might be normal)
You can share your report for further opinion on the final result.