Critical Values - Biochemistry

If a critical or panic value is encountered during routine Biochemistry testing, the ordering physician is immediately contacted and notified of result(s). If this occurs after regular office hours, the ordering physician (or physician on-call) will be contacted via answering service or at home. A Medical Biochemist is notified and will provide a consultative service when required.

Test

Less Than

Greater Than

Comments

Alcohol, Ethyl

80 mmol/L

Amylase

1000 U/L

Bicarbonate

10 mmol/L

45 mmol/L

Bilirubin (babies)

300 umol/L

Calcium

1.5 mmol/L

3.5 mmol/L

Carbamazepine

85 umol/L

CK

10,000u/L

 

Troponin I

0.06 ug/L

Cortisol

140 nmol/L

not on dexamethasone

Digoxin

3.5 nmol/L

Dilantin

160 umol/L

Glucose (Adult)

2.0 mmol/L

28 mmol/L

Glucose (Adult)

2.0 mmol/L

22 mmol/L

with positive Ketones

Glucose (Child 7 days to 17 years)

2.0 mmol/L

20 mmol/L

Glucose (Child < 7 days)

2.0 mmol/L

15 mmol/L

Glucose (Any gestation)

20.0 mmol/L

Lead

7 umol/L

Lipase

1000 U/L

Lithium (< 65 yrs)

2.0 mmol/L

Lithium (65 and over)

1.5 mmol/L

Magnesium

0.4 mmol/L

3.0 mmol/L

Potassium

2.5 mmol/L

6.5 mmol/L

unhemolyzed

Sodium

120 mmol/L

160 mmol/L

T4 (Free) (0-2yrs)

6 pmol/L

50 pmol/L

T4 (Free) (> 2 yrs)

2 pmol/L

TSH (< 4 days)

1.0 mU/L

20 mU/L

TSH (4 days to 2 yrs)

10 mU/L

Valproic Acid

1000 umol/L

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