| Basic Metabolic Panel (BMP) | Na 135-145, K 3.5-5.0, Cl 98-106, HCO₃ 22-28, BUN 7-20, Cr 0.6-1.2, Glucose 70-110 |
| Complete Blood Count (CBC) | WBC 4-11k, Hgb 12-18, Hct 36-48%, Plt 150-400k |
| Coagulation Studies | PT 11-14, INR 0.8-1.1 (2-3 therapeutic), aPTT 30-40, D-dimer <0.5< /td> |
| Cardiac Enzymes | Troponin I <0.04, CK-MB <5, BNP <100 |
| Liver Function Tests | AST 10-40, ALT 10-40, Total bili 0.1-1.2 |
| Arterial Blood Gases (ABGs) | pH 7.35-7.45, PaCO₂ 35-45, HCO₃ 22-26, PaO₂ 80-100, O₂ sat 95-100% |
NCLEX Lab Values: Complete Reference Guide for 2025
Understanding NCLEX lab values is one of the most important skills for nursing students preparing for the exam. The NCLEX frequently tests your ability to interpret lab results, identify emergencies, and make safe clinical decisions. This updated 2025 NCLEX lab values guide provides all essential ranges you must memorize to succeed.
- BMP
- CBC
- Cardiac
- LFTs
- ABGs
Why Lab Values Matter for NCLEX
Lab values help nurses determine a patient's status quickly. On NCLEX, abnormal values often indicate life‑threatening situations requiring immediate intervention. These values appear in NGN case studies, bow‑tie items, matrix questions, and prioritization scenarios. Mastering normal lab ranges is key to answering these questions with confidence.
Basic Metabolic Panel (BMP)
These labs assess kidney function, hydration status, and electrolyte balance:
- Sodium (Na): 135–145 mEq/L
- Potassium (K): 3.5–5.0 mEq/L
- Chloride (Cl): 98–106 mEq/L
- Bicarbonate (HCO₃): 22–28 mEq/L
- BUN: 7–20 mg/dL
- Creatinine: 0.6–1.2 mg/dL
- Glucose: 70–110 mg/dL
Complete Blood Count (CBC)
These values help identify infection, oxygenation issues, and bleeding risk:
- WBC: 4,000–11,000 /mm³
- Hemoglobin: 12–16 g/dL (female), 14–18 g/dL (male)
- Hematocrit: 36–48%
- Platelets: 150,000–400,000 /mm³
Coagulation Studies
These determine clotting ability and bleeding risk:
- PT: 11–14 seconds
- INR: 0.8–1.1 (therapeutic: 2–3 for warfarin)
- aPTT: 30–40 seconds
- D‑dimer: < 0.5 µg/mL
Cardiac Enzymes
These labs indicate heart damage or failure:
- Troponin I: < 0.04 ng/mL
- CK‑MB: < 5 ng/mL
- BNP: < 100 pg/mL
Liver Function Tests (LFTs)
- AST: 10–40 U/L
- ALT: 10–40 U/L
- Total bilirubin: 0.1–1.2 mg/dL
Arterial Blood Gases (ABGs)
These assess respiratory and metabolic balance:
- pH: 7.35–7.45
- PaCO₂: 35–45 mmHg
- HCO₃: 22–26 mEq/L
- PaO₂: 80–100 mmHg
- O₂ saturation: 95–100%
| Category | Lab Test | Normal Range | Clinical Significance |
|---|---|---|---|
| BMP | Sodium | 135-145 | Fluid balance, neuro status |
| Potassium | 3.5-5.0 | Cardiac rhythm, muscle function | |
| BUN | 7-20 | Kidney function, hydration | |
| Creatinine | 0.6-1.2 | Kidney function | |
| Glucose | 70-110 | Diabetes, stress response | |
| WBC | 4-11k | Infection, inflammation | |
| Hgb | 12-18 | Anemia, oxygenation | |
| Coag | INR | 0.8-1.1 (therapeutic 2-3) | Anticoagulation therapy |
| Cardiac | Troponin | <0.04 | Myocardial infarction |
| ABG | pH | 7.35-7.45 | Acid-base balance |
Tips for Studying Nursing Lab Values
- Group labs by system for easier memorization.
- Use flashcards daily for repetition.
- Associate abnormal values with symptoms.
- Practice NCLEX-style lab interpretation questions.
- Create mnemonic devices for hard-to-remember ranges.
- Focus on high-yield values: K+, Na+, Glucose, Troponin, INR.
- Potassium (3.5-5.0): "3.5 to 5.0 keeps the heart alive"
- Calcium (8.5-10.5): "8.5 to 10.5 keeps bones alive"
- INR (2-3 therapeutic): "2 to 3 for Coumadin therapy"
Lab Values Mastery Checklist
Final Thoughts
Mastering these nursing lab values is essential for NCLEX success. With this complete 2025 reference guide, you'll confidently recognize abnormal results, prioritize care, and handle NGN clinical judgment questions with ease.
Memorize essential NCLEX lab values: BMP (Na, K, BUN, Cr, glucose), CBC (WBC, Hgb, Plt), Coag (INR), Cardiac (Troponin), ABGs (pH, PaCO₂, HCO₃)-associate abnormalities with symptoms.