Biochemistry

 

Units Upper limit Lower limit Age Parameter
U/L > 1000 – Aminotransferases
μmol/L >300

>110

 – Adult

0-16 years old

 Ammonia
U/L >250 – Amylase
mg/dL >15 Bilirubin , total (Neonatal)
mg/dL >13 <6.5 Calcium, Total
ng/L >160 – Cardiac troponin I(cTnI)
ng/L >100 – Cardiac troponin T(cTnT)
mmol/L >120 <80 Chloride
mg/dL ≥ 1.5

≥ 2.0

≥ 2.5

≥ 3.0

≥ 10.0

 

 – 1 day – 4 weeks

5 weeks – 23 mos

2 yrs – 11 yrs

12 yrs -15 yrs

≥ 16 yrs

 Creatinine
U/L >500 – Creatine phosphokinase, Total (CPK)
Positive D-dimers
ng/mL >3 – Digoxin
mg/dL  

<35
<40
<55

  

0-2 days
>2 days & <1 year
>1 year

 Glucose, Serum

 
mg/dL  

>200
>300
>450

  

<30 days
>30 days & <17 yrs
>17 yrs

 Glucose, Serum

 
mg/dL >300 <30 Glucose, CSF
μg/dL >350 – Iron, Serum
mg/dL >60 – Lactate
U/L >1000 – Lactate dehydrogenase
IU/L >700 – Lipase
mg/dL >4.7 <1.0 Magnesium
mg/dL >9

 

  

≤2.5
≤2.0
≤1.5

  

<3 years of age
3-12 years of age
>12 years of age

 Phosphorus

 
mEq/L              >6  

<2.5
<3.0

 Any age

Less than 1 week
Older than 1 week

 Potassium

 
mg/dL >45 – Protein, CSF
mEq/L >160 <120 Sodium
mg/dL >80 – BUN
mg/dL >13 – Uric Acid

References

  1. ARUP Laboratories
  2. Stanford Anatomic Pathology & Clinical Laboratories
  3. Mayo Medical Laboratories
  4. Department of LABORATORY MEDICINE, University of Washington.
  5. Thomas L. Critical limits of laboratory results for urgent clinician notification. EJIFCC. 2003;14:1-8.
  6. Emancipator K. Critical values: ASCP practice parameter. American journal of clinical pathology. 1997 Sep 1;108(3):247-53.
  7. McFarlane A, Aslan B, Raby A, Bourner G, Padmore R. Critical values in Hematology. International journal of laboratory hematology. 2015 Feb 1;37(1):36-43.