OVERVIEW
These are the official lab values that you will be given during the USMLE exam (and they have been taken directly from the practice software released by the test makers)
BLOOD, PLASMA, SERUM
Alanine aminotransferase (ALT): 8-20 U/L
Amylase, serum: 25-125 U/L
Aspartate aminotransferase (AST): 8-20 U/L
Bilirubin, serum (adult) Total// Direct: 0.1-1.0 mg/dL // 0.0-0.3 mg/dL
Calcium, serum (Ca²+): 8.4-10.2 mg/dL
Cholesterol, serum: Rec: <200 mg/dL
Cortisol, serum: 0800 h: 5-23 µg/dL // 1600 h: 2-15 µg/dL // 2000 h: ≤ 50% of 0800 h
Creatine kinase, serum:
- Male: 25-90 U/L
- Female: 10-70 U/L
Creatinine, serum: 0.6-1.2 mg/dL
Electrolytes, serum:
- Sodium (Na+): 136-145 mEq/L
- Chloride (Cl-): 95-105 mEq/L
- Potassium (K+): 3.5-5.0 mEq/L
- Bicarbonate (HCO3-): 22-28 mEq/L
- Magnesium (Mg²+): 1.5-2.0 mEq/L
Estriol, total, serum (in pregnancy):
- 24-28 wks: 30-170 ng/mL
- 28-32 wks: 40-220 ng/mL
- 32-36 wks: 60-280 ng/mL
- 36-40 wks: 80-350 ng/mL
Ferritin, serum:
- Male: 15-200 ng/mL
- Female: 12-150 ng/mL
Follicle stimulating hormone (FSH), serum/plasma:
- Male: 4-25 mlU/mL
- Female (premenopausal): 4-30 mlU/mL
- Female (midcycle peak): 10-90 mlU/mL
- Female (postmenopause): 40-250 mlU/mL
Gases, arterial blood (room air):
- pH: 7.35-7.45
- Pc02: 33-45 mmHg
- P02: 75-105 mm Hg
Glucose, serum:
- Fasting: 70-110 mg/dL
- 2-h postprandial: < 120 mg/dL
Growth hormone- arginine stimulation:
- Fasting: < 5 ng/mL
- Provocative stimuli: > 7 ng/mL
Immunoglobulins, serum:
- IgA: 76-390 mg/dL
- IgE: 0-380 IU/mL
- IgG: 650-1500 mg/dL
- IgM: 40-345
Iron: 50-170 µg/dL
Lactate dehydrogenase, serum: 45-90 U/L
Luteinizing hormone (LH), serum/plasma:
- Male: 6-23 mlU/mL
- Female (follicular phase): 5-30mlU/mL
- Female (midcycle): 75-150 mlU/mL
- Female (postmenopause): 30-200 mlU/mL
Osmolality, serum: 275-295 mOsmol/kg H2O
Parathyroid hormone, serum, N-terminal: 230-630 pg/mL
Phosphatase (alkaline), serum (p-NPP at 30°C): 20-70 U/L
Phosphorous (inorganic), serum: 3.0-4.5 mg/dL
Prolactin, serum (hPRL): <20 ng/mL
Proteins, serum:
- Total (recumbent): 6.0-7.8 g/dL
- Albumin: 3.5-5.5 g/dL
- Globulin: 2.3-3.5 g/dL
Thyroid-stimulating hormone (TSH), serum or plasma: 0.5-5.0 µU/mL
Thyroidal iodine (¹²³I) uptake: 8-30% of administered dose/24 h
Thyroxine (T4), serum: 5-12 µg/dL
Triglycerides, serum: 35-160 mg/dL
Triiodothyronine (T3), serum (RIA): 115-190 ng/dL
Triiodothyronine (T3), resin uptake: 25-35%
Urea nitrogen, serum: 7-18 mg/dL
Uric acid, serum: 3.0-8.2 mg/dL
HEMATOLOGIC
Bleeding time (template): 2-7 minutes
Erythrocyte count:
- Male: 4.3-5.9 million/mm³
- Female: 3.5-5.5 million/mm³
Erythrocyte sedimentation rate/ESR (Westergren):
- Male: 0-15 mm/h
- Female: 0-20 mm/h
Hematocrit:
- Male: 41-53%
- Female: 36-46%
Hemoglobin A1C: ≤ 6%
Hemoglobin, blood:
- Male: 13.5-17.5 g/dL
- Female: 12.0-16.0 g/dL
Hemoglobin, plasma: 1-4 mg/dL
Leukocyte count and differential:
- Leukocyte count: 4500-11,000/mm³
- Segmented neutrophils: 54-62%
- Bands: 3-5%
- Eosinophils: 1-3%
- Basophils: 0-0.75%
- Lymphocytes: 25-33%
- Monocytes: 3-7%
Mean corpuscular hemoglobin (MCH): 2.54-34.6 pg/cell
Mean corpuscular hemoglobin concentration (MCHC): 31%-36% Hb/cell
Mean corpuscular volume (MCV): 80-100µm³
Partial thromboplastin time/PTT (activated): 25-40 seconds
Platelet count: 150,000-400,000/mm³
Prothrombin time: 11-15 seconds
Reticulocyte count: 0.5%-1.5% of red cells
Thrombin time: <2 seconds deviation from control
Volume:
- Plasma (Male): 25-43 mL/kg
- Plasma (Female): 28-45 mL/kg
- Red cell (Male): 20-36 mL/kg
- Red cell (Female): 19-31 mL/kg
CEREBROSPINAL
Cell count: 0-5/mm³
Chloride: 118-132 mEq/L
Gamma globulin: 3-12% total proteins
Glucose: 40-70 mg/dL
Pressure: 70-180 mm H2O
Proteins, total: <40 mg/dL
URINE
Calcium: 100-300 mg/24 h
Chloride: varies with intake
Creatinine clearance:
- Male: 97-137 mL/min
- Female: 88-128 mL/min
Estriol, total (in pregnancy):
- 30 wks: 6-18 mg/24 h
- 35 wks: 9-28 mg/24 h
- 40 wks: 13-42 mg/24 h
17-Hydroxycorticosteroids:
- Male: 3.0-10.0 mg/24 h
- Female: 2.0-8.0 mg/24 h
17-Ketosteroids, total:
- Male: 8-20 mg/24 h
- Female: 6-15 mg/24 h
Osmolality: 50-1400 mOsmol/kg H2O
Oxalate: 8-40 µg/mL
Potassium: varies with diet
Proteins, total: <150 mg/24 h
Sodium: varies with diet
Uric acid: varies with diet
SWEAT
Chloride: 0-35 mmol/L
BMI
Adult: 19-25 kg/m²
Page Updated: 01.22.2016