Hi. 
   In COHERE 2014 merger we are collecting LAB_ID=MCV (Mean Corpuscular   Volume). The standard unit of measurement of this is 'femtoliters'. 
   I would like to suggest to add this as LAB_U=16 
   (And the reason we want to add it as '16' is that in the latest COHERE SOP we have 13=µg/L,  14=mg/24h and 15=mg/mmol) 
   Best Regards,  Rikke Brandt (chip)