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Set water bath to 100°C and allow it to reach temperature.
Add 10 mL of sample to a clean tube. Note: this test uses a 16 mm diameter tube.
Use this to "blank" the instrument. Fit the Tubetest adapter to Lumiso, insert tube and press Blank.
To an empty 16 mm tube, add 5 mL of sample.
Top up to the 10 mL line with Urea Liquid Reagent.
Invert tube gently to mix. Do not shake.
Add a Urea No1 tablet and a Urea No2 tablet. Crush both tablets until fully dissolved.
Invert tube gently to mix. Do not shake.
Place in water bath and leave for exactly 30 minutes at 100⁰C.
Carefully remove and dry tube.
Without delay, place tube in cell holder and press Measure to obtain the concentration of Urea.
