<prompt>  A 28-year-old lady has put on weight 10 kg over a period of 3 years and has oLigomenorrhoea followed by amenorrhoea for 8 months. The blood pressure is 160100 mm of Hg. Which of the following are the most appropriate investigations -Serum electrolytesPlasma cortisolPlasma testosterone and ultrasound evaluation of pelvisT3, T4 and TSH 