Labs Flashcards
Hyponatremia
Normal: 136 - 145 mEq/L
Causes: loop diuretics, heart failure, renal failure, CHF, cirrhosis, edema
Hypernatremia
Normal: 136-145 mEq/L
Causes: renal dysfunction, fever, burns, thirst, excessive diarrhea/vomiting/sweating
Hypokalemia
Normal: 3.5-5 mEq/L
Causes: insulin, loop and thiazide diuretics, refeeding syndrome
Hyperkalemia
Normal: 3.5-5 mEq/L
Causes: meds like cyclosporine, metabolic acidosis, renal disease, adrenal insufficiency (Addison’s disease)
Hypophosphatemia
Normal: 3-4.5 mg/dl
Causes:
- increased phos binders
- Tums (has Ca)
- refeeding syndrome
- low intake
- HYPERPARATHYROIDISM
Hyperphosphatemia
Normal: 3-4.5 mg/dl
Causes: high phos diet, not enough phos binders
Hypocalcemia
Normal: 4.5-5.5 mEq/L; 9-11 mg/dl
Causes: vitamin D deficiency, glucocorticoids, loop diuretics, hyperphosphatemia, hypoalbuminemia, renal failure
Hypercalcemia
Normal: 4.5-5.5 mEq/L; 9-11 mg/dl
Causes: hyperparathyroidism, malignancies, calcium supplements, excessive vitamin D intake
Low BUN
Normal: 10-20 mg/dl
Causes: fluid overload, liver disease, malnutrition
meat intake could throw off BUN test
High BUN
Normal: 10-20 mg/dl
Causes:
dehydration
- fever
- burns
- CHF
renal dysfunction
- high protein diet
- kidney stones
- DKA
meat intake could throw off BUN test
Low creatinine
Normal: 0.6-1.4 mg/dl
Causes:
- muscle mass loss (elderly)
- muscle atrophy
- SCI
- liver disease
- fluid overload
- low protein diet
High creatinine
Normal: 0.6-1.4 mg/dl
Causes: Renal dysfunction, catabolism, athletes, hyperthyroidism, certain cancer and antibiotic meds
Elevated BUN:Cr ratio
Normal: 10:1-15:1
Causes: renal disease, CHF, dehydration
d/t decreased blood flow to kidneys
Hypoalbuminemia
Normal: 3.5-5 g/dl
Causes: surgery, trauma, infection, inflammation, Crohn’s, poor PO d/t illness, edema, fluid overload
3 week half life, doesn’t reflect current protein intake
Hyperalbuminemia
Normal: 3.5-5 g/dl
Causes: dehydration, severe diarrhea
3 week half life, doesn’t reflect current protein intake