Critical Values

PATHLAB CRITICAL VALUE

 

Biochemistry

Parameters

Low Critical Value

High Critical Value

Bicarbonate

<10 mmol/L

>40 mmol/L

Bilirubin ( New Born)

 -

>18 mg/dL

Calcium

<7 mg/dL

>13.0 mg/dL

Glucose

<40 mg/dL

>400 mg/dL

Phosphate

<1 mg/dL

-

Potassium

<2.5 mmol/L

>6 mmol/L

Sodium

<120 mmol/L

  -

 

Haematology

Parameters

Low Critical Value

High Critical Value

White Blood Cells

< 2 x 109 /L

> 25 x 109/L

Pack cell Volume (Haematocrit)

< 18 %

Female  : > 55 %
Male      : > 60 %

Haemoglobin

< 6 g/dl

Female  : > 18 g/dl
Male      : > 20 g/dl

Platelet Count

< 80 x 109 /L

> 1,000 x 109 /L

Reticulocyte

None

> 20 %

Prothrombin Time

None

> 40 s
or 3 times control time

Activated Partial Thromboplastin Time

None

> 90 s

INR

 

> 4.5

Peripheral Blood Film

  • Presence of blast cells
  • New diagnosis of Leukemia, Sickle Cell Anaemia
  • Presence of Malaria or other blood parasite

 

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