2014-03-07 USMLE lab medicine - USMLE lab medicine Flashcards
1
Q
2 major causes of inability to concentrate urine
A
- diabetes insipidus
- sickle cell disease/trait
2
Q
In pregnancy, high ESR means
A
nothing, always elevated
3
Q
In pregnancy, normal BUN or Cr may mean
A
renal disease
4
Q
4 non-pancreatic sources of amylase
A
- salivary glands
- rest of GI tract
- renal failure
- ruptured tubal pregnancy
5
Q
Elevated lipase AND amylase =
A
pancreatitis
6
Q
Test specific for biliary alkaline phosphatase
A
GGT (gamma-glutamyltraspeptidase) or 5-nucleosidase
7
Q
Side effect of chlorpropamide
A
SIADH
8
Q
What does hyponatremia mean in a diabetic patient
A
Careful…sodium may be arificially low in hyperglycemia
9
Q
pH relation of calcium and potassium
A
they move in the same direction (into cells with alkalosis)
10
Q
Persistantly low K or Ca is likely complicated by
A
low Mg
11
Q
BUN/Cr ratio >15 usually indicates
A
dehydration
