Product Name:	Urea (BUN) Quick Test Strips (BA0203)
SKU:	BA0203
Detection Method:	Visual (colorimetric test strip). Based on urease-catalysed conversion of urea to ammonium and carbon dioxide; the pH of the reaction medium is monitored by a chromogen and the intensity of the product colour is directly proportional to the urea concentration in the sample, read by comparison against a reference chart.
Detection Range:	Semi-quantitative measurement of urea or blood urea nitrogen (BUN) in the sample
Sample Type:	Biological samples such as serum, plasma and urine, and food samples such as milk
Species Reactivity:	All
Assay Time:	Under 15 minutes
Kit Size:	10 tests
Equipment Required:	Benchtop
Storage:	Store at room temperature. Keep strips dry and out of direct sunlight.
Shelf Life:	6 months upon receipt
Shipping:	Room Temperature

These test strips estimate urea semi-quantitatively using urease-catalysed conversion of urea to ammonium and carbon dioxide, with the resulting pH change monitored by a chromogen. Sample is applied directly to the strip reaction pad (undiluted) or after dilution in the supplied tube, colour is allowed to develop for five minutes and the reaction pad is compared against the provided urea chart. The reading is multiplied by the dilution factor (e.g. 2x, 31x or 1 for undiluted samples) to obtain the urea concentration, which can be converted to BUN.

Fast and convenient. Results in under 15 minutes.
No sophisticated laboratory instruments required.
Suitable for serum, plasma, urine and milk samples.

Direct determination of urea or blood urea nitrogen (BUN) concentrations in biological samples such as serum, plasma and urine and food samples such as milk.

Note: The below protocol is a sample protocol. Protocols are specific to each batch/lot. For the correct instructions please follow the protocol included in your kit.

Step	Procedure
1	For samples that do not require dilution, transfer 20 µL of sample directly onto the strip reaction pad using a 20 µL transfer pipette or pipettor, then proceed to the colour development step.
2	For samples requiring a 2x dilution, transfer 20 µL of dH2O into an empty Dilution tube using a 20 µL transfer pipette, then add 20 µL of sample using the same pipette. For samples requiring a 31x dilution, transfer a total of 600 µL of dH2O into an empty Dilution tube using a 300 µL transfer pipette twice, then add 20 µL of sample using a 20 µL transfer pipette.
3	Replace the cap, close securely and invert the vial a couple of times to mix the diluted sample.
4	Unscrew the cap and use a new 20 µL transfer pipette to transfer 20 µL of the diluted sample directly onto the strip reaction pad.
5	Shake the strip a couple of times to remove any clinging drops and let the colour develop for 5 minutes.
6	Compare the colour of the reaction pad with the provided Urea Chart on the test strip bag and multiply the concentration by the dilution used (i.e. 2x, 31x or 1 for undiluted samples) to determine the urea concentration in the sample.

Read the urea concentration by comparing the developed reaction pad against the provided Urea Chart, then multiply the chart value by the dilution factor used (2x, 31x or 1 for undiluted samples). Conversions: BUN (mg/L) = [Urea] (mg/L) / 2.14; 1 mg/L urea equals 0.1 mg/dL, 16.7 µM, 0.0001% or 1 ppm.