Obtain immediate ECG (electrolyte abnormalities)
Total CK
Urinalysis
CBC
Chemistry, including Mag, Phos
Uric acid
LFTs
VBG, venous pH
DIC panel
Coags, FSP, fibrinogen
Coags, FSP, fibrinogen
Total CK
Most consider<unk>  if 5x or greater increase above upper limit of normal (~2000)
Serum CK begins to rise 2-12hr after injury, peaks within 24-72hr
Degree of CK elevation correlates with muscle injury, but NOT renal failure
CK-MB
May be normal or mildly elevated (<5% of total)
Uric Acid - elevates before CK
Myoglobinuria
Urinalysis = +blood, no RBCs (Sn ~80%)
Myoglobin is cleared within 1-6hr (often see elevated CK with no myoglobinuria)
Acute renal failure
Creatinine increase
Electrolyte abnormalities
Hyperkalemia
Hyperphosphatemia
Hypocalcemia
Hyperuricemia
LFTs elevation
Intramuscular release of AST/ALT  with AST>ALT.
Most consider<unk>  if 5x or greater increase above upper limit of normal (~2000)
Serum CK begins to rise 2-12hr after injury, peaks within 24-72hr
Degree of CK elevation correlates with muscle injury, but NOT renal failure
May be normal or mildly elevated (<5% of total)
Urinalysis = +blood, no RBCs (Sn ~80%)
Myoglobin is cleared within 1-6hr (often see elevated CK with no myoglobinuria)
Creatinine increase
Hyperkalemia
Hyperphosphatemia
Hypocalcemia
Hyperuricemia
Intramuscular release of AST/ALT  with AST>ALT.
Rhabdomyolysis
Compartment syndrome
Diabetic ketoacidosis 
Contusion
Diabetic ketoacidosis
Crush syndrome
Tumor lysis syndrome
Degloving injury