How NIPT determines fetal sex, how accurate it is from 10 weeks, the recognised causes of discordant results, and the clinical reasons it matters.
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How the day-21 progesterone confirms ovulation, how to time it when cycles are irregular, and what a low result does and does not mean.
Why Ureaplasma parvum, U. urealyticum and Mycoplasma hominis are usually normal flora, what a positive result means and when treatment is justified.