PART two Clines Reference intervals Higher concentrations are seen in newborns 2
ID: 206520 • Letter: P
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PART two Clines Reference intervals Higher concentrations are seen in newborns 256 eral circulation (as in cirrhosis function is severely impaired, am from the circulation and blood High concentrations of NH, are ciated with encephalopathy. Amm processes in the brain, which vary somewhat with the method used." In severe live fun Plasma 19-60 ldL 11-35 Adut Urine. 24h 140-1,500 10-107 mmol Child(10 d Plasma 66-136 dL umoli toxic species, and impairs astrocyte fun is associated of urea cycle enzymes. Measu of mg Nid N/d is important in the diagnosis and 40-80 ammonia these inherited metabolic disorders (see hapr to 2 y) For additional student resources, please visit the questions 1. Which one of the following is not an NPN substance? 6. Elevated blood urea concentration is termed a. Allantoin b. Ammonia c. Creatinine d. Urea a. Azotemia b. BUN c. Uremia d. Uremic syndrome 2. Which compound constitutes nearly half of the NPN 7. Prerenal azotemia is caused by substances in the blood? a. Ammonia b. Creatine c. Urea d. Uric acid a. Acute renal failure b. Chronic renal failure c. Congestive heart failure d. Urinary tract obstruction 8. A technologist obtains a urea N value of 61 mg/dl. 3. A technologist reports urea N of 9 mg/dL. What is the urea concentration for this sample? a. 3.2 mg/dL b. 4.2 mg/dL c. 18.0 mg/dL d. 19.3 mg/dL and a serum creatinine value of 2.5 mg/dL on a patient. These results indicate a. Congestive heart failure b. Dehydration c. Glomerular nephritis d. Urinary tract obstruction 4. Which blood collection tube additive can be used to 9. Uric acid is the final product of collect a specimen for measurement of urea? a. Ammonium b. Lithium heparin c. Sodium citrate d. Sodium fluoride a. Allantoin metabolism b. Amino acid metabolism c. Purine metabolisnm d. The urea cycle 5. In the clinical laboratory, urea N is measured most 10. Sources of error in measurement of uric acid often using a. Conductivity b. Enzymatic reactions c. Isotope dilution mass spectrometry d. Multilayer film formats arrow spectrophotometer bandwidth d. Nonspecific enzyme activity a. Assay interference b. Competition from alternate purine substratesExplanation / Answer
1) The correct option is a. Allantoin.
Allantoin is a chemical compound. It is a major metabolic intermediate in most organisms, which include animals, plants and bacteria.
2) The correct option is c. Urea.
NPN can used to artificially raise crude protein values, which are measured based on nitrogen content, such as urea is 47% nitrogen, which is nearly half of the NPN substances in the blood.
3) The correct option is d.19.3mg/dL.
A BUN of 9 mg/dL is obtained by a technologist. The concentration of urea is 19.3 mg/dL.
4) The correct option is d.Sodium fluoride.
.
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