My wife is 24 weeks pregnant, and has to go for weekly blood pressure readings as there is a history of pre-eclampsia in the family, and they found a notch on the doppler test at 20 weeks. She does not seem to have any signs of pre-eclampsia as blood pressure is normal, no problems protein in urine, and none of the other symptoms, but she had blood tests recently and the results have come back with a higher than normal ALT reading (84). She is due to have further tests next week but is a little worried by the results. What could it be?