Common Laboratory Values Every Nurse Must Know

Common Laboratory Values Every Nurse Must Know
In this video, we will discuss the most important laboratory values every nursing student and staff nurse should know. These values are frequently asked in exams, interviews, and clinical practice.
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1. Hemoglobin (Hb)

Normal Values

Male: 13.5–17.5 g/dL

Female: 12–15.5 g/dL
Clinical Significance

⬇ Low Hb → Anemia, blood loss

⬆ High Hb → Dehydration, polycythemia
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2. White Blood Cell Count (WBC)

Normal Value

4,000–11,000 cells/mm³
Significance

⬆ Increased → Infection, inflammation

⬇ Decreased → Bone marrow disorders, viral infections
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3. Platelet Count

Normal Value

150,000–450,000/mm³
Significance

⬇ Low Platelets → Bleeding risk

⬆ High Platelets → Clotting risk
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4. Random Blood Sugar (RBS)

Normal Value

Less than 140 mg/dL
Significance

⬆ High → Diabetes mellitus

⬇ Low → Hypoglycemia
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5. Serum Sodium (Na⁺)

Normal Value

135–145 mEq/L
Significance

⬇ Hyponatremia → Confusion, seizures

⬆ Hypernatremia → Dehydration
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6. Serum Potassium (K⁺)

Normal Value

3.5–5.0 mEq/L
Significance

⬇ Hypokalemia → Muscle weakness, arrhythmias

⬆ Hyperkalemia → Cardiac arrest risk
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7. Serum Calcium

Normal Value

8.5–10.5 mg/dL
Significance

⬇ Low Calcium → Muscle cramps

⬆ High Calcium → Kidney stones
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8. Serum Creatinine

Normal Value

0.6–1.2 mg/dL
Significance

⬆ Elevated → Kidney dysfunction
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9. Blood Urea Nitrogen (BUN)

Normal Value

7–20 mg/dL
Significance

⬆ Increased → Kidney disease, dehydration
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10. Oxygen Saturation (SpO₂)

Normal Value

95–100%
Significance

⬇ Below 90% → Requires immediate attention
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11. Prothrombin Time (PT)

Normal Value

11–13.5 seconds
Significance

Used to assess blood clotting function.
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12. International Normalized Ratio (INR)

Normal Value

0.8–1.1
Therapeutic Range

2–3 (for patients on anticoagulants)
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Conclusion

Understanding normal laboratory values helps nurses identify abnormalities early, monitor patient progress, and provide safe patient care.

Thank you for watching!

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🩺 MUST KNOW LAB VALUES FOR NURSES

Learn the most important laboratory values every nurse should know. This video covers normal ranges, clinical significance, and nursing implications of common lab tests used in daily patient care.

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