Master INR Lab Value with Picmonic for Nursing RN

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Normal Electrolyte Lab Values

Picmonic

2 mins

Potassium (K+) Lab Value

Picmonic

20 secs

Sodium (Na+) Lab Value

Picmonic

24 secs

Chloride (Cl-) Lab Value

Picmonic

27 secs

Calcium (Ca2+) Lab Value

Picmonic

25 secs

INR Lab Value

International-building

Picmonic

Because of the variability in reagents used to calculate the prothrombin time (PT) between laboratories, the INR or PT ratio was developed to create an international standard. It is the ratio between the patient’s PT to a control PT.

3 KEY FACTS

INR or PT Ratio is a normalized value ratio that standardizes the measurement among labs for PT. The normal range for INR or PT ratio is between 0.8-1.2, but check your lab's range as it can differ slightly. Remember that because it is a ratio you want the value to be close to 1.

Patients on warfarin (Coumadin) are monitored via their INR, which should be 2.0 to 3.0 (higher than the normal range).

Patients on warfarin (Coumadin) should have values between 2 to 3.

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