The laboratory requirements are that you need to ensure that the boric acid tube you use at ward level fits with the urine analyser in the pathology lab. Somerset NHS Foundation Trust use a BD Urine Analyser and the 10ml DWK boric acid tubes fit without being too snug within the analyser enabling the urine sample to be loaded easily and removed by the laboratory assistant when using the urine analyser.
The boric acid 10ml tube must only be filled with around 7ml of urine from the PiP and no more or it may leak when analysed.