 [ Symptoms ] can hydromorphone 8mg x 3 and methadone 10mg x 6 daily cause a false positive for morphine in a drug test  i recently tested positive for morphine but have not taken it in any form what can cause this false positive [ Disease ] not really many people have lower than average body temperatures the temp 98 6 is considered average but there are many variations throughout the day the morning temperature is the lowest assuming that you are healthy and well this lower temperature is not considered medically significant