Can I use glucose measured using two different devices in my study?

Question

[Faith]

Hi,

I'm working with glucose data that was measured for one year on 150 samples, first 50 were measured with a device. Second 50 were measured with I-STAT and the other with Accu-chek. Both are in the same units mg/dl.

The last 50 out of 150 were measured with both devices for each sample, difference between measures vary between 30 to 0, with nearly 30% have the exact same glucose value.

Can I use merge both columns of different values into one column called Glucose that have the full 150 values (While merging the shared 50). Or would it be possible instead to turn those values into categorical values as a way to represent them from different measures.

What are your thoughts on this?