According to the scope, IEC 60601-1 is only for medical devices with patient contact, this may include some IVD devices where the sample is taken using the same device (such as home use blood sugar level testers).
However, for the vast majority of IVDs the patient is well removed, and hence IEC 60601-1 is not applicable. The correct standard is IEC 61010-1, and any particulars that apply to your device.
There is persistent and incorrect use of IEC 60601-1 for anything that is electrical and medical because of the title of the standard. The scope itself which refers to patient contact are buried inside the standard.
The FDA complicates this, because IEC 60601-1 is listed as a recognized consensus standard, while IEC 61010-1 is not. Thus, many feel more comfortable using IEC 60601-1 in the US even though it is not the correct standard.
In Europe, you will definately have to use the correct standard: IEC 61010-1 and any particulars that are applicable.