alculated Chemistry Values
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| BUN:Creatinine ratio | BUN/Creatinine | 12-20 | ↑ in pre or postrenal azotemia
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| Creatinine clearance | UxVx1.73/PxSx1440 U-urine creatinine; P-plasma creatinine; V-urine volume in ml per 24hr; S-body surface | ♂ 97-137 ml/min; ♀ 88-128 ml/min | ↑ in renal disease
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| Friedewald formula | LDL=Total cholesterol -HDL-(tryglicerides/5) | <130 mg/dL | ↑ in coronary artery disease;
not valid if tryglicerides >400 mg/dL
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| Calculated Osmolality | 1.86xNa + (glucose/18) + (BUN/2.8) + 9 | 275 - 295 mOsm/kg | ↑ in dehydration; uremia; diabetes; alcohol intoxication
↓ in excessive H2O intake
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| mg/dL into mmol/L | mmol/L =(mg/dL)x 10 x valence / MW |
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| A:G ratio | albumin/(total protein -albumin) | 1-2.5 | Reversed ratio - multiple myeloma, liver disease
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| Anion Gap | (Na+K)-(Cl+CO2) | 10-20 mEq/L | ↑ in renal failure, diabetic and lactic acidosis, drugs, toxins, lab. error
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