Like "Not just eatting carbs can cause a spike, If I eat fruit in the evenings I can get a huge spike, so any fruit I injest needs to come before lunchtime. -also in my nutrition class we were told how one woman had eaten an orange as her last snack and when she monitored it spiked she washed her hands really well and tested again and got a normal reading. she realized she must have had some of the orange still on her hands. even though she had washed her hands it wasn't enough. Like the others have said if it is an abnormal reading wash well and try again just to make sure"