Siemens DCA Vantage Operator's Manual page 52

5. Using a lint-free tissue, carefully wipe the outside of the glass capillary.
Figure 12 Wiping Outside of the Glass Capillary
Do not allow the tissue to touch the open end of the glass capillary.
NOTE:
Contact with the open end of the capillary could result in loss of sample (by
wicking into the tissue). If sample loss is obvious, discard the capillary holder.
Repeat the procedure using a new capillary holder.
6. Inspect the glass capillary for the presence of bubbles.
If bubbles are obvious, discard the capillary holder and repeat the
procedure using a new capillary holder.
52 DCA Vantage Operator's Guide