![]() ![]() Massive and disproportionate elevation of blood urea nitrogen in acute azotemia. Feinfeld DA, Bargouthi H, Niaz Q, Carvounis CP.BUN/Cr ratio as an index of gastrointestinal bleeding mass in children. Urashima M, Toyoda S, Nakano T, Matsuda S, Kobayashi N, Kitajima H, Tokushige A, Horita H, Akatsuka J, Maekawa K.ED predictors of upper gastrointestinal tract bleeding in patients without hematemesis. Witting MD, Magder L, Heins AE, Mattu A, Granja CA, Baumgarten M.Plasma creatinine and urea: creatinine ratio in patients with raised plasma urea. INCREASED UREA:CREATININE RATIO – (Drivers Can use GPS)ĭECREASED UREA:CREATININE RATIO (I am a SIMPLE SR) become like creatinine -> ratio gets closer to 1).>100:1 – pre-renal cause (urea absorption increased compared to creatinine).40-100:1 – normal or post renal cause of AKI.Urea:Creatinine Ratio (in the setting of renal failure / elevated creatinine) Cr : Urea ratio with SI Units of µmol/L: mmol/L (providing Urea is >10mmol/L).Urea : Cr ratio ith SI Units of mmol/L: µmol/L (providing Urea is >10mmol/L).BUN : Cr ratio with US units of mg/dL : mg/dL.Therefore two ratio’s exist to compare serum Urea and Creatinine levels Similarly Creatinine (Cr) is expressed as mg/dL in the US and µmol/L elsewhere. ![]() Elsewhere Urea (U) is expressed as mmol/L.In the US the urea is expressed as BUN (Blood Urea Nitrogen) in mg/dL.The relationship of urea and creatine is dependent on serum laboratory units used to determine the cause of acute kidney injury. can be used as an indicator of the likely cause of renal failure.urea reabsorbed by tubules via regulation.urea and creatinine both freely filtered at the glomerulus.Glucose: 2.8 – 4.2 mmol/L (or ≥ 60% plasma glucose concentration) Protein: 0.15 – 0.45 g/L (or <1% of the serum protein concentration) Normal cell counts do not rule out meningitis or any other pathology.No neutrophils present, primarily lymphocytes.Perinuclear Anti-Neutrophil Cytoplasmic Antibodies (p-ANCA):Ĭytoplasmic Anti-Neutrophil Cytoplasmic Antibodies (c-ANCA): Random urine osmolality: 300 – 900 mOsm/kgġ2h fluid-restricted urine osmolality: > 850 mOsm/kgĢ4h urine sodium (Na +): 100 – 260 mmol/24hĢ4h urine potassium (K +): 25 – 100 mmol/24h Total iron binding capacity (TIBC): 45 – 81 μmol/Līiochemistry ¹ Urea & electrolytes (U&Es) Mean corpuscular haemoglobin (MCH): 27 – 32 pg/cellĪctivated partial thromboplastin time (APTT): 24 – 37 seconds You might also be interested in our OSCE Flashcard Collection which contains over 2000 flashcards that cover clinical examination, procedures, communication skills and data interpretation. ![]()
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