Medical Lab Reference Values

Comprehensive normal lab values reference for clinicians, medical students, and healthcare professionals.

All values sourced from Tietz Clinical Guide to Laboratory Tests (5th Edition), KDIGO guidelines, AHA/ACC guidelines, and Mayo Clinic Laboratories.

For interactive lab reference pages with clinical context, visit MDTools.org.

Chemistry Panel

Test	Normal Range	Units	MDTools Reference
Sodium	136-145	mEq/L	Sodium Levels
Potassium	3.5-5.0	mEq/L	Potassium Levels
Chloride	98-106	mEq/L	Chloride Levels
Calcium	8.5-10.5	mg/dL	Calcium Levels
Creatinine (M)	0.7-1.3	mg/dL	Creatinine Levels
Creatinine (F)	0.6-1.1	mg/dL	Creatinine Levels
BUN	7-20	mg/dL	—
Albumin	3.5-5.5	g/dL	Albumin Levels
Total Bilirubin	0.1-1.2	mg/dL	Bilirubin Levels
ALP	44-147	IU/L	ALP Levels

Cardiac Markers

Test	Normal Range	Units	MDTools Reference
BNP	<100	pg/mL	BNP Levels
Troponin I	<0.04	ng/mL	—
CK-MB	<5	ng/mL	—

Inflammatory Markers

Test	Normal Range	Units	MDTools Reference
CRP	<0.3	mg/dL	CRP Levels
ESR (M)	0-15	mm/hr	—
ESR (F)	0-20	mm/hr	—
Procalcitonin	<0.1	ng/mL	—

Hematology

Test	Normal Range	Units
WBC	4,500-11,000	/µL
RBC (M)	4.7-6.1	million/µL
RBC (F)	4.2-5.4	million/µL
Hemoglobin (M)	14-18	g/dL
Hemoglobin (F)	12-16	g/dL
Hematocrit (M)	42-52	%
Hematocrit (F)	37-47	%
Platelets	150,000-400,000	/µL
MCV	80-96	fL

Coagulation

Test	Normal Range	Units
PT	11-13.5	seconds
INR	0.8-1.1	ratio
aPTT	25-35	seconds
D-dimer	<0.5	µg/mL FEU
Fibrinogen	200-400	mg/dL

Liver Function

Test	Normal Range	Units	MDTools Reference
AST	10-40	U/L	—
ALT	7-56	U/L	—
ALP	44-147	IU/L	ALP Levels
GGT	9-48	U/L	—
Total Bilirubin	0.1-1.2	mg/dL	Bilirubin Levels
Direct Bilirubin	0.0-0.3	mg/dL	Bilirubin Levels
Albumin	3.5-5.5	g/dL	Albumin Levels

Thyroid Function

Test	Normal Range	Units
TSH	0.4-4.0	mIU/L
Free T4	0.8-1.8	ng/dL
Free T3	2.3-4.2	pg/mL
Total T4	4.5-12.0	µg/dL

Iron Studies

Test	Normal Range	Units
Serum Iron	60-170	µg/dL
TIBC	250-370	µg/dL
Transferrin Saturation	20-50	%
Ferritin (M)	12-300	ng/mL
Ferritin (F)	12-150	ng/mL

Lipid Panel

Test	Desirable	Borderline	High
Total Cholesterol	<200	200-239	≥240
LDL	<100	100-159	≥160
HDL (M)	>40	—	—
HDL (F)	>50	—	—
Triglycerides	<150	150-199	≥200

Related Clinical Calculators

• GFR Calculator — CKD-EPI 2021 equation
• Creatinine Clearance — Cockcroft-Gault
• A1C Calculator — HbA1c to average glucose
• Corrected Calcium — Albumin-corrected calcium
• Anion Gap — With albumin correction
• FENa Calculator — Fractional excretion of sodium
• Sodium Correction — For hyperglycemia
• LDL Calculator — Friedewald equation
• BUN/Creatinine Ratio — Pre-renal vs intrinsic
• Transferrin Saturation — Iron studies
• Osmolality Calculator — Serum osmolality
• Free Water Deficit — Hypernatremia correction

Sources

1. Tietz Clinical Guide to Laboratory Tests, 5th Edition (2018)
2. KDIGO Clinical Practice Guideline for CKD (2024)
3. AHA/ACC Guidelines on Cardiovascular Risk Assessment (2019)
4. Mayo Clinic Laboratories Reference Values
5. Quest Diagnostics Reference Ranges

License

MIT — Technology Island Inc

Links

• Interactive Lab References: mdtools.org
• Clinical Calculators: 100+ free tools
• GitHub: computerdude11111/mdtools