USMLE Step 1 Laboratory Reference Values - NBME
Alanine Aminotransferase (ALT), Serum***** - : 8-20 U/L
Amylase - : 25-125 U/L
Aspartate Aminotransferase (AST), serum***** - : 8-20 U/L
Bilirubin, serum (adult) Total//Direct - : 0.1-1.0 mg/dL // 0.0-0.3 mg/dL
Calcium, serum ***** - : 8.4-10.2 mg/dL
Cholesterol, serum***** - : Rec: <200 mg/dL
Cortisol, serum - : 0800h: 5-23mcg/dL
1600h: 3-15 mcg/dL
2000h: </=50& of 0800h
Creatine kinase, serum - : Male: 25-90 U/L
Female: 10-70 U/L
Creatinine, serum***** - : 0.6-1.2 mg/dL
Sodium - : 136-145 mEq/L
Estriol, total serum (in pregnancy)
24-28 wks
28-32 wks
32-36 wks
36-40 wks - : Estriol, total serum (in pregnancy)
30-170 ng/mL
40-220 ng/mL
60-280 ng/mL
80-350 ng/mL
Ferritin, serum - : Male: 15-200 ng/mL
Female: 12-150 ng/mL
FSH, serum/plasma - : Male: 4-25 mIU/mL
Female:
Premenopause: 4-30 mIU/mL
Midcycle peak: 10-90 mIU/mL
Postmenopause: 40-250 mIU/mL
Gases, arterial blood (room air)
pH - : Gases, arterial blood (room air)
7.35-7.45
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 - : Immunoglobulins, serum
76-390 mg/dL
Iron - : 50-170 mcg/dL
Lactate dehydrogenase, serum - : 45-90 U/L
LH, serum/plasma - : Male: 6-23 mIU/mL
, Female:
Follicular phase: 5-30 mIU/mL
Midcycle: 75-150 mIU/mL
Postmenopause: 30-200 mIU/mL
Osmolality, serum - : 275-295 mOsmol/kg H2O
PTH, serum, N-terminal - : 230-630 pg/mL
Phosphatase (alkaline), serum (p-NPP at 30deg C)***** - : 20-70 U/L
Phosphorus (inorganic), serum***** - : 3.0-4.5 mg/dL
Proteins, serum
Total (recumbent) - : Proteins, serum
6.0-7.8 g/dL
TSH, serum or plasma - : 0.5-5.0 mcg/mL
Thyroidal iodine (123I) uptake - : 8%-30% of administered dose/24h
Thyroxine (T4), serum - : 5-12 mcg/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
BMI - : Adult: 19-25 kg/m2
CSF
Cell count - : CSF
0.5/mm3
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 (Westergren) - : Male: 0-15 mm/h
Female: 0-20 mm/h
Hematocrit - : Male: 41%-53%
Female: 36%-46%
Hemoglobin A1c - : </=6%
Hemoglobin, plasma - : 1-4 mg/dL
Leukocyte Count and Differential
Leukocyte count - : Leukocyte Count and Differential
4500-11,000/mm3
Mean corpuscular hemoglobin - : 25.4-34.6 pg/cell
Mean corpuscular hemoglobin concentration - : 31%-36% Hb/cell
Mean corpuscular volume - : 80-100 mcm3
Partial thromboplastin time (activated) - : 25-40 seconds
Platelet count - : 150,000-400,000/mm3
Prothrombin time - : 11-15 seconds
Reticulocyte Count - : 0.5%-1.5%
Thrombin time - : <2 seconds deviation from control
Blood Volume
Plasma - : Blood Volume
Male: 25-43 mL/kg
Alanine Aminotransferase (ALT), Serum***** - : 8-20 U/L
Amylase - : 25-125 U/L
Aspartate Aminotransferase (AST), serum***** - : 8-20 U/L
Bilirubin, serum (adult) Total//Direct - : 0.1-1.0 mg/dL // 0.0-0.3 mg/dL
Calcium, serum ***** - : 8.4-10.2 mg/dL
Cholesterol, serum***** - : Rec: <200 mg/dL
Cortisol, serum - : 0800h: 5-23mcg/dL
1600h: 3-15 mcg/dL
2000h: </=50& of 0800h
Creatine kinase, serum - : Male: 25-90 U/L
Female: 10-70 U/L
Creatinine, serum***** - : 0.6-1.2 mg/dL
Sodium - : 136-145 mEq/L
Estriol, total serum (in pregnancy)
24-28 wks
28-32 wks
32-36 wks
36-40 wks - : Estriol, total serum (in pregnancy)
30-170 ng/mL
40-220 ng/mL
60-280 ng/mL
80-350 ng/mL
Ferritin, serum - : Male: 15-200 ng/mL
Female: 12-150 ng/mL
FSH, serum/plasma - : Male: 4-25 mIU/mL
Female:
Premenopause: 4-30 mIU/mL
Midcycle peak: 10-90 mIU/mL
Postmenopause: 40-250 mIU/mL
Gases, arterial blood (room air)
pH - : Gases, arterial blood (room air)
7.35-7.45
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 - : Immunoglobulins, serum
76-390 mg/dL
Iron - : 50-170 mcg/dL
Lactate dehydrogenase, serum - : 45-90 U/L
LH, serum/plasma - : Male: 6-23 mIU/mL
, Female:
Follicular phase: 5-30 mIU/mL
Midcycle: 75-150 mIU/mL
Postmenopause: 30-200 mIU/mL
Osmolality, serum - : 275-295 mOsmol/kg H2O
PTH, serum, N-terminal - : 230-630 pg/mL
Phosphatase (alkaline), serum (p-NPP at 30deg C)***** - : 20-70 U/L
Phosphorus (inorganic), serum***** - : 3.0-4.5 mg/dL
Proteins, serum
Total (recumbent) - : Proteins, serum
6.0-7.8 g/dL
TSH, serum or plasma - : 0.5-5.0 mcg/mL
Thyroidal iodine (123I) uptake - : 8%-30% of administered dose/24h
Thyroxine (T4), serum - : 5-12 mcg/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
BMI - : Adult: 19-25 kg/m2
CSF
Cell count - : CSF
0.5/mm3
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 (Westergren) - : Male: 0-15 mm/h
Female: 0-20 mm/h
Hematocrit - : Male: 41%-53%
Female: 36%-46%
Hemoglobin A1c - : </=6%
Hemoglobin, plasma - : 1-4 mg/dL
Leukocyte Count and Differential
Leukocyte count - : Leukocyte Count and Differential
4500-11,000/mm3
Mean corpuscular hemoglobin - : 25.4-34.6 pg/cell
Mean corpuscular hemoglobin concentration - : 31%-36% Hb/cell
Mean corpuscular volume - : 80-100 mcm3
Partial thromboplastin time (activated) - : 25-40 seconds
Platelet count - : 150,000-400,000/mm3
Prothrombin time - : 11-15 seconds
Reticulocyte Count - : 0.5%-1.5%
Thrombin time - : <2 seconds deviation from control
Blood Volume
Plasma - : Blood Volume
Male: 25-43 mL/kg
