Our algorithm for management of MPN pregnancy in 2023. Saving Babies Lives version 3³⁰; ∗additional risk factors for thrombosis in pregnancy taken from the NHS England list³⁰; ∗∗generally accepted features of placental insufficiency include³¹ abnormal or nonreassuring fetal surveillance tests; abnormal Doppler flow velocity wave forms analysis suggestive of fetal hypoxemia; oligohydramnios; and postnatal birth weight less than the 10th percentile for gestational age. IFN, interferon. Model was adapted from Harrison and Robinson.⁹