1. Fine-tuning of routine combined first- trimester screening: The ratio of serum-free- beta-human chorionic gonadotropin (fβ-hCG) to pregnancy-associated plasma protein-A (PAPP-A) could improve performance of Down syndrome screening program, a retrospective cohort study in Iran
- Author
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Mohammad Mahdi Taheri Amin, Soudeh Ghafouri-Fard, Pourandokht Saadati, Shahram Savad, Saloomeh Amidi, Mohammad-Hossein Modarresi, Bahareh Yazdani, Fatemeh Yazarlou, Soudabeh Jamali, Sarang Younesi, and Elham Razmpoosh
- Subjects
medicine.medical_specialty ,Down syndrome ,Pregnancy-associated plasma protein A ,Immunology ,Medical laboratory ,Iran ,State Medicine ,Odds ,03 medical and health sciences ,0302 clinical medicine ,Pregnancy ,medicine ,Immunology and Allergy ,Cutoff ,Humans ,Pregnancy-Associated Plasma Protein-A ,Chorionic Gonadotropin, beta Subunit, Human ,030212 general & internal medicine ,Retrospective Studies ,030219 obstetrics & reproductive medicine ,Obstetrics ,business.industry ,Multiple of the median ,Retrospective cohort study ,General Medicine ,Guideline ,medicine.disease ,Pregnancy Trimester, First ,Female ,Down Syndrome ,business ,Biomarkers - Abstract
OBJECTIVES: To evaluate the performance of the current national screening policy for Down syndrome (DS) in Iran and suggest a more efficient protocol with a wealth of a large series of first-trimester screening (FTS) data obtained from Nilou medical laboratory. To fulfill this aim, detection rate (DR), positive screening rate (PSR), false negative rate (FNR) and odds of being affected given a positive results (OAPR) were calculated at different cutoff risk. In the latest update of DS screening program in Iran, there is no place for intermediate group to be further investigated. Next, we proposed a novel parameter namely the ratio of fβ-hCG multiple of the median (MoM) value to PAPP-A MoM value to delicately categorize FTS results in a way that reduce FNR without imposing unnecessary anxious and extra money on most families. METHODS: The present investigation was conducted retrospectively on 197,210 pregnancies undergoing FTS for aneuploidies in Nilou medical laboratory, Tehran, Iran, from March 2015 to February 2016. RESULTS: Intermediate risk group is important as 23 out of 45 FN fell in the range 1:250 to 1:1100. By applying the proposed index, the ratio of fβ-hCG MoM to PAPP-A MoM and subsequent decision about NIPT, 8 out of 23 FN cases in intermediate group could be detected. CONCLUSION: Compared with the current policy, our novel proposed approach had better performance and could be applied by the Iran National Health Service to improve the screening program guideline.
- Published
- 2020