Comparison of day 3 FSH serum values as determined by six different immunoassays

BACKGROUND: The accurate assessment of FSH concentration is important for evaluating ovarian function priorto IVF. However, a number of different assay techniques are currently in use, leading to inconsistencies in thehormone data being reported. To address this problem, we measured FSH concentration using a number ofcommercially available systems. METHODS: Day 3 serum FSH levels were measured in 215 healthy fertile womenusing six different immunoassays: Coatria