A 32 year old lady in her fourth pregnancy presents at 37 weeks of gestation following spontaneous rupture of membranes. Her pregnancy was uncomplicated. Her only comorbidity is mild intermittent bronchial asthma, with no recent exacerbations.
Fetal heart sounds are noted.
Her blood group is A +ve (positive). 1 pint of blood is cross matched.
You realize that a transvaginal ultrasound scan might irritate the cord and cause vasospasm.
You realize that cardiotocography may result in unnecessary delay.