Quick Reference

Normal Lab Values Reference

Comprehensive reference for normal laboratory values in adults. Includes both conventional (US) and SI units where applicable.

Showing 71 lab values

Test	Abbr	Normal Range (US)	SI Units	Notes
White Blood Cells	WBC	4,500-11,000 /μL	4.5-11.0 ×10⁹/L	—
Red Blood Cells (Male)	RBC	4.5-5.5 ×10⁶/μL	4.5-5.5 ×10¹²/L	—
Red Blood Cells (Female)	RBC	4.0-5.0 ×10⁶/μL	4.0-5.0 ×10¹²/L	—
Hemoglobin (Male)	Hgb	14-18 g/dL	140-180 g/L	—
Hemoglobin (Female)	Hgb	12-16 g/dL	120-160 g/L	—
Hematocrit (Male)	Hct	40-54 %	—	—
Hematocrit (Female)	Hct	36-48 %	—	—
Platelets	PLT	150,000-400,000 /μL	150-400 ×10⁹/L	—
Mean Corpuscular Volume	MCV	80-100 fL	—	—
Mean Corpuscular Hemoglobin	MCH	27-33 pg	—	—
Mean Corpuscular Hemoglobin Concentration	MCHC	32-36 g/dL	—	—
Red Cell Distribution Width	RDW	11.5-14.5 %	—	—
Sodium	Na	136-145 mEq/L	136-145 mmol/L	—
Potassium	K	3.5-5.0 mEq/L	3.5-5.0 mmol/L	—
Chloride	Cl	98-106 mEq/L	98-106 mmol/L	—
Bicarbonate	CO2/HCO3	22-28 mEq/L	22-28 mmol/L	—
Blood Urea Nitrogen	BUN	7-20 mg/dL	2.5-7.1 mmol/L	—
Creatinine	Cr	0.6-1.2 mg/dL	53-106 μmol/L	Values vary by muscle mass, age, sex
Glucose (Fasting)	FBG	70-100 mg/dL	3.9-5.6 mmol/L	—
Calcium	Ca	8.5-10.5 mg/dL	2.1-2.6 mmol/L	—
Total Protein	TP	6.0-8.3 g/dL	60-83 g/L	—
Albumin	Alb	3.5-5.0 g/dL	35-50 g/L	—
Total Bilirubin	Tbili	0.1-1.2 mg/dL	2-21 μmol/L	—
Direct Bilirubin	Dbili	0.0-0.3 mg/dL	0-5 μmol/L	—
Alkaline Phosphatase	ALP	44-147 U/L	—	—
Aspartate Aminotransferase	AST	10-40 U/L	—	—
Alanine Aminotransferase	ALT	7-56 U/L	—	—
Total Cholesterol	TC	<200 mg/dL	<5.2 mmol/L	Desirable <200, Borderline 200-239, High ≥240
LDL Cholesterol	LDL	<100 mg/dL	<2.6 mmol/L	Optimal <100, Near optimal 100-129
HDL Cholesterol	HDL	>40 mg/dL	>1.0 mmol/L	Low <40, High ≥60 (protective)
Triglycerides	TG	<150 mg/dL	<1.7 mmol/L	Normal <150, Borderline 150-199
Thyroid Stimulating Hormone	TSH	0.4-4.0 mIU/L	—	—
Free T4	FT4	0.8-1.8 ng/dL	10-23 pmol/L	—
Free T3	FT3	2.3-4.2 pg/mL	3.5-6.5 pmol/L	—
Troponin I	TnI	<0.04 ng/mL	—	Reference varies by assay
Troponin T	TnT	<0.01 ng/mL	—	Reference varies by assay
BNP	BNP	<100 pg/mL	—	Age-dependent cutoffs
NT-proBNP	NT-proBNP	<125 pg/mL	—	Age-dependent cutoffs
Creatine Kinase	CK	30-200 U/L	—	—
CK-MB	CK-MB	0-5 ng/mL	—	—
Prothrombin Time	PT	11-13.5 seconds	—	—
INR	INR	0.9-1.1 ratio	—	Therapeutic 2-3 for most indications
Partial Thromboplastin Time	PTT	25-35 seconds	—	—
Fibrinogen	Fib	200-400 mg/dL	—	—
D-Dimer	D-dimer	<500 ng/mL FEU	—	Age-adjusted cutoff: age × 10 if >50
Hemoglobin A1c	HbA1c	<5.7 %	—	Prediabetes 5.7-6.4%, Diabetes ≥6.5%
Fasting Glucose	FBG	<100 mg/dL	<5.6 mmol/L	Prediabetes 100-125, Diabetes ≥126
eGFR	eGFR	>90 mL/min/1.73m²	—	CKD staging: G1 ≥90, G2 60-89, G3a 45-59, G3b 30-44, G4 15-29, G5 <15
Uric Acid (Male)	UA	3.5-7.2 mg/dL	208-428 μmol/L	—
Uric Acid (Female)	UA	2.5-6.2 mg/dL	149-369 μmol/L	—
C-Reactive Protein	CRP	<1.0 mg/dL	<10 mg/L	—
High-Sensitivity CRP	hs-CRP	<3.0 mg/L	—	CV risk: Low <1, Average 1-3, High >3
ESR (Male)	ESR	0-15 mm/hr	—	—
ESR (Female)	ESR	0-20 mm/hr	—	—
Procalcitonin	PCT	<0.1 ng/mL	—	Bacterial infection marker
Serum Iron	Fe	60-170 μg/dL	11-30 μmol/L	—
Total Iron Binding Capacity	TIBC	250-370 μg/dL	45-66 μmol/L	—
Ferritin (Male)	Ferritin	20-250 ng/mL	—	—
Ferritin (Female)	Ferritin	10-120 ng/mL	—	—
Transferrin Saturation	TSAT	20-50 %	—	—
Magnesium	Mg	1.7-2.2 mg/dL	0.7-0.9 mmol/L	—
Phosphorus	Phos	2.5-4.5 mg/dL	0.8-1.5 mmol/L	—
pH (Arterial)	pH	7.35-7.45	—	—
pCO2	pCO2	35-45 mmHg	—	—
pO2	pO2	80-100 mmHg	—	—
Bicarbonate (ABG)	HCO3	22-26 mEq/L	—	—
Oxygen Saturation	SaO2	95-100 %	—	—
Urine pH	pH	4.5-8.0	—	—
Urine Specific Gravity	SG	1.005-1.030	—	—
Urine Protein	Prot	Negative	—	—
Urine Glucose	Gluc	Negative	—	—

Important Notice

Reference ranges vary between laboratories based on patient populations, testing methods, and equipment. Always use your institution's specific reference ranges for clinical decision-making. Pediatric, geriatric, and pregnancy values may differ significantly.

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