Ion Selective Electrodes or?

 

Just in time for the daily morning draws, the ISE results start delta failing. Every patient. Dear God what did I screw up during maintenance.  Did I mismatch the reference solution? Did I not prime the new tubing well enough with pooled serum? The QC and calibrations were in though??? Ughh. More like Ion Selectively-working electrodes. 

 I think every chemistry instrument in existence is in a constant state of having the ion selective electrodes not working in some way or another. We should just start reporting semi-qualitatively. Probably low, Probably normal, probably high.