L4: CHEMICAL EXAMINATION (LEUKOCYTE ESTERASE, SG, AA)

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10 Terms

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positive

  • in infections caused by bacteria, trichomonas, chlamydia, yeast, and interstitial nephritis

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negative

  • in lymphocyte-predominant conditions

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hydrolysis of leukocyte esterase

  • principle of leukocyte esterase

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10-25 wbcs/uL

  • sensitivity of leukocyte esterase

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dilute

  • low specific gravity

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concentrated

  • high specific gravity

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change in pKa of a polyelectrolyte

  • principle of specific gravity

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refractometry or urinometry

  • confirmatory tests for specific gravity

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ascorbic acid

  • is a common interferent in urine strip testing

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phosphomolybdate reduction reaction

  • principle of ascorbic acid