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  /Title (nclex-rn-lab-values.pdf)
  /Creator (Cheatography)
  /Author (bytebar)
  /Subject (NCLEX-RN Lab Values Cheat Sheet)
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    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{NCLEX-RN Lab Values Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{bytebar} via \textcolor{DarkBackground}{\uline{cheatography.com/218949/cs/48451/}}}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}bytebar \\
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 20th September, 2026.\\
   Updated 21st September, 2026.\\
   Page {\thepage} of \pageref{LastPage}.
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  Measure your website readability!\\
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\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Electrolytes}}  \tn
% Row 0
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Sodium (Na+) & 135–145 mEq/L — critical \textless{}120 or \textgreater{}160 \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Potassium (K+) & 3.5–5.0 mEq/L — critical \textless{}2.5 or \textgreater{}6.0; check ECG (peaked T / U waves) \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
Calcium (Ca2+) & 8.5–10.5 mg/dL — Trousseau's/Chvostek's signs when low \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
Magnesium (Mg2+) & 1.5–2.5 mEq/L — low Mg worsens refractory hypokalemia \tn 
% Row Count 11 (+ 3)
% Row 4
\SetRowColor{LightBackground}
Phosphorus & 2.5–4.5 mg/dL \tn 
% Row Count 12 (+ 1)
% Row 5
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Chloride (Cl−) & 98–106 mEq/L \tn 
% Row Count 14 (+ 2)
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\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Kidney \& Metabolic}}  \tn
% Row 0
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BUN & 10–20 mg/dL — rises with dehydration and renal failure \tn 
% Row Count 3 (+ 3)
% Row 1
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Creatinine & 0.6–1.2 mg/dL — best single indicator of renal function \tn 
% Row Count 6 (+ 3)
% Row 2
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\seqsplit{BUN:Creatinine} ratio & \textasciitilde{}10:1 normal; high ratio suggests prerenal cause (dehydration) \tn 
% Row Count 9 (+ 3)
% Row 3
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Glucose (fasting) & 70–100 mg/dL — critical \textless{}40 or \textgreater{}400 \tn 
% Row Count 11 (+ 2)
% Row 4
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HbA1c & \textless{}5.7\% normal; ≥6.5\% diabetes \tn 
% Row Count 13 (+ 2)
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WBC & 5,000–10,000/mm$^{\textrm{3}}$ — high = infection/inflammation \tn 
% Row Count 2 (+ 2)
% Row 1
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RBC & M 4.5–5.5 / F 4.0–5.0 million/mm$^{\textrm{3}}$ \tn 
% Row Count 4 (+ 2)
% Row 2
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\seqsplit{Hemoglobin} & M 14–18 / F 12–16 g/dL — critical \textless{}5 or \textgreater{}20 \tn 
% Row Count 6 (+ 2)
% Row 3
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\seqsplit{Hematocrit} & M 40–54\% / F 36–46\% — roughly 3× hemoglobin \tn 
% Row Count 8 (+ 2)
% Row 4
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\seqsplit{Platelets} & 150,000–400,000/mm$^{\textrm{3}}$ — critical \textless{}20,000 (bleeding risk) \tn 
% Row Count 10 (+ 2)
% Row 5
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PT & 11–12.5 sec — monitors warfarin with INR \tn 
% Row Count 12 (+ 2)
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INR & 0.8–1.1 normal; therapeutic on warfarin 2.0–3.0 — critical \textgreater{}5 \tn 
% Row Count 15 (+ 3)
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aPTT & 30–40 sec — monitors heparin; therapeutic 1.5–2.5× normal \tn 
% Row Count 17 (+ 2)
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pH & 7.35–7.45 \tn 
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% Row 1
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\seqsplit{PaCO₂} & 35–45 mmHg — respiratory component (up = acidosis) \tn 
% Row Count 3 (+ 2)
% Row 2
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\seqsplit{HCO₃⁻} & 22–26 mEq/L — metabolic component \tn 
% Row Count 5 (+ 2)
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PaO₂ & 80–100 mmHg; SaO₂ 95–100\% \tn 
% Row Count 6 (+ 1)
% Row 4
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\mymulticolumn{2}{x{17.67cm}}{Quick read: match the abnormal value to its system — CO₂ abnormal = respiratory, HCO₃ abnormal = metabolic; pH tells acidosis vs alkalosis} \tn 
% Row Count 9 (+ 3)
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Digoxin & 0.8–2.0 ng/mL — toxicity: vision changes, anorexia, arrhythmias; check K+ first \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
Lithium & 0.6–1.2 mEq/L — toxicity \textgreater{}1.5; maintain hydration and salt intake \tn 
% Row Count 7 (+ 3)
% Row 2
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Phenytoin (Dilantin) & 10–20 mcg/mL — toxicity: nystagmus, ataxia, slurred speech \tn 
% Row Count 10 (+ 3)
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Theophylline & 10–20 mcg/mL — toxicity: tachycardia, seizures \tn 
% Row Count 12 (+ 2)
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\mymulticolumn{1}{x{17.67cm}}{K+ \textless{}2.5 or \textgreater{}6.0, Na+ \textless{}120 or \textgreater{}160, platelets \textless{}20,000, Hgb \textless{}5, glucose \textless{}40 or \textgreater{}400, INR \textgreater{}5} \tn 
% Row Count 2 (+ 2)
% Row 1
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\mymulticolumn{1}{x{17.67cm}}{NCLEX rule: unstable \seqsplit{airway/breathing/circulation} beats lab values — assess the patient, then report critical labs immediately} \tn 
% Row Count 5 (+ 3)
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\mymulticolumn{1}{x{17.67cm}}{📘 Exam-ready? Get the \{\{link="https://bytebarhq.com/b/v0tGe"\}\}NCLEX-RN Study Guide\{\{/link\}\} — \$5 at bytebarhq.com} \tn 
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