Triple test for diagnosis of Down's syndrome includes all of the following except –: (A) β–HCG, (B) α–Fetoprotein, (C) Serum HPL level, (D) Serum oestriol level
Answer is C. Triple test is a combined biochemical test which includes → MSAFP, HCG, & Oestriol

In an affected pregnancy  
level of MSAFP is decreased
level of oestriol is decreased
the level of hCG is High (increased)