There are a myriad of precautionary measures to consider when executing sensitive current measurements with 1-channel DC-DC converters. Below is just one unwritten rule that I recently came by in Electronic Design's website. 

When performing an inductor current measurement with the buck converter illustrated, at which side should the current probe be placed for stable (less noise-prone) oscilloscope plots?

Case I. After the inductor.



 Case II. Before the inductor.
(the schematics are courtesy of Electronic Design with a few minor modifications)

To answer the question, let us analyze what is happening in both cases.

Case I shows the probe after the inductor. At this side, we expect the voltage waveform to be near DC with negligible ripple (if the capacitance is chosen correctly). This is due to the electromotive inertia provided by the capacitor when the high side FET/transistor is in cut-off. (Further evidence can be shown by taking the state equations for all possible states of the FETs, but this is outside the topic)

Looking at Case II, the probe is at the switching side of the converter's power stage. At this node, the voltage is switching (as both the high and low side FETs turn on and off alternatingly - never at the same time - a gap called dead time to avoid a short from supply to ground). This switching is characterized by fast rise and fall times at high frequency (typically in the MHz range for mobile applications). Such undesirable voltage characteristics may affect the measured current waveform, hence the more practical case (and the answer to our question) is Case I.

The original article from Electronic Design written by Mr. Frederik Dostal with the following hyperlink suggests more useful approaches to tackling inductor current measurements. 
He mentions an additional method pertaining to the use of shunt resistors, being impractical because of the possibility of switching noise coupling with the resistor. Actually, I do not recommend this approach too but with the more primal reason of inserting resistor parasitics into the branch (even more so if the shunt resistor is wire-wound and not the bar/metal film type).
There is a lot more to learn from the other article, especially if the reader is new to inductor current measurement. It will definitely be a worthwhile read.