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The pH strip is used for the determination of pH. The four colors on each strip correlate to. a pH range of 0 to 14. In the presence of fluid with normal pH (7.0), the strip willshow. the four colors of yellow-orange, orange, olive green, and yellow. In the presence of acidic. fluids (pH 5), the strip will display the four colors of yellow-orange, orange, tan and. yellow. The pH of gastric fluid is normally acidic.
Using test strips that are expired can cause your results to be inaccurate. If your test strips have expired, throw them away and begin using a new vial of strips that are not expired.The expiration date is printed on every vial of test strips.sing test strips that are expired can cause your results to be inaccurate. If your test strips have expired, throw them away and begin using a new vial of strips that are not expired.