There is no such thing as a short PICC line.
PICC stands for peripherally inserted central catheter with the emphasis here on CENTRAL.
Both INS and NAVAN state that a PICC should be placed into the distal third of the SVC. You never
want to intentionally place a PICC a shorter distance such as only to the Subclavian for the patient will be at a higher risk for EVERY
complications and especially thrombosis. If any nurse is doing this and a complication should arise you can get sued b/c you are not following the standard of care...as in the patient that won a 7.2 million lawsuit for his 2 PICC lines that were intentionally placed in the Subclavain vein. There are a lot of hoops you need to jump through if clinically you do need to use a suboptimally placed CVC of any type but I will not go into that now.
I suspect you saw a midline catheter
which is no longer than 20 cm and the tip must be in the upper third of the arm and never go into the chest. These have a lot of limitations in terms of what you can use them for. let me know if you want more detail
A short line is a PIV with the catheter being 3 inches or less
and the tip in a peripheral vein..better to just describe what you used and where anatomically it is placed.
A long line is a central line with the tip in a large vein in the chest and subject to chest pressure
or in the case of a HD catheter with an RA tip placement. Again it is better to be specific with type of CVC and its anatomical insertion site and tip location.