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NORMAL LABORATORY VALUES
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U.S. traditional units are followed in parentheses by equivalent values expressed in S.I. units.
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Hematology
Activated partial thromboplastin time — 25-35 s
Bleeding time — Less than 10 min
Erythrocyte count — 4.2-5.9 × 106/µL (4.2-5.9 x 1012 cells/L)
Erythrocyte sedimentation rate
Male: 0-15 mm/h
Female: 0-20 mm/h
Erythropoietin — less than 30 mU/mL (30 U/L)
D-Dimer — less than 0.5 µg/mL (500 mg/L)
Ferritin, serum — 15-200 ng/mL (15-200 mg/L)
Haptoglobin, serum — 50-150 mg/dL (500-1500 mg/L)
Hematocrit
Male: 41%-51%
Female: 36%-47%
Hemoglobin, blood
Male: 14-17 g/dL (140-170 g/L)
Female: 12-16 g/dL (120-160 g/L)
Leukocyte alkaline phosphatase — 15-40 mg of phosphorus liber-
ated/h per 1010 cells; score = 13-130/100 polymorphonuclear
neutrophils and band forms
Leukocyte count — 4000-10,000/µL (4.0-10 × 109/L)
Mean corpuscular hemoglobin — 28-32 pg
Mean corpuscular hemoglobin concentration —
32-36 g/dL (320-360 g/L)
Mean corpuscular volume — 80-100 fL
Platelet count — 150,000-350,000/µL (150-350 × 109/L)
Prothrombin time — 11-13 s
Reticulocyte count — 0.5%-1.5% of erythrocytes; absolute: 23,000-
90,000 cells/µL (23-90 × 109/L)
Schilling test (oral administration of radioactive cobalamin-labeled
vitamin B12) — 8.5%-28% excreted in urine per 24-48 h
Blood, Plasma, and Serum Chemistry Studies
Albumin, serum – 3.5-5.5 g/dL (35-55 g/L)
Alkaline phosphatase, serum – 36-92 U/L
α-Fetoprotein, serum — 0-20 ng/mL (0-20 µg/L)
Aminotransferase, alanine (ALT) — 0-35 U/L
Aminotransferase, aspartate (AST) — 0-35 U/L
Ammonia, plasma — 40-80 µg/dL (23-47 µmol/L)
Amylase, serum — 0-130 U/L
Antinuclear antibody, serum – positive: titer of greater than, equal
to 1:160
Bicarbonate, serum — 23-28 meq/L (23-28 mmol/L)
Bilirubin, serum
Total — 0.3-1.2 mg/dL (5.1-20.5 µmol/L)
Direct — 0-0.3 mg/dL (0-5.1 µmol/L)
Blood gases, arterial (patient breathing room air)
pH - 7.38-7.44
Pco2 - 35-45 mm Hg
Po2 - 80-100 mm Hg
Oxygen saturation – 95% or greater
Blood urea nitrogen – 8-20 mg/dL (2.9-7.1 mmol/L)
Calcium, serum — 9-10.5 mg/dL (2.2-2.6 mmol/L)
Carbon dioxide content, serum — 23-28 meq/L (23-28
mmol/L)
Chloride, serum — 98-106 meq/L (98-106 mmol/L)
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