Critical Lab Values Cheat Sheet | Cheat Sheet Laboratory Practices and Management

LABORATORY VALUES

U.S. traditional units are followed in parentheses by equivalent values expressed in S.I. units.

Hematology

Absolute neutrophil count

Male — 1780-5380/µL (1.78-5.38 x 109/L)

Female — 1560-6130/µL (1.56-6.13 x 109/L)

Activated partial thromboplastin time — 25-35 s

Bleeding time — less than 10 min

Erythrocyte count — 4.2-5.9 x 106/µL (4.2-5.9 x 1012/L)

Erythrocyte sedimentation rate

Male — 0-15 mm/h

Female — 0-20 mm/h

Erythropoietin — less than 30 mU/mL (30 units/L)

D-Dimer — less than 0.5 µg/mL (0.5 mg/L)

Ferritin, serum — 15-200 ng/mL (15-200 µg/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

liberated/h per 1010 cells; score = 13-130/100

polymorphonuclear neutrophils and band forms

Leukocyte count — 4000-10,000/µL (4.0-10 x 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 x 109/L)

Prothrombin time — 11-13 s

Reticulocyte count — 0.5%-1.5% of erythrocytes; absolute:

23,000-90,000/µL (23-90 x 109/L)

Blood, Plasma, and Serum

Chemistry Studies

Albumin, serum — 3.5-5.5 g/dL (35-55 g/L)

Alkaline phosphatase, serum — 36-92 units/L

α-Fetoprotein, serum — 0-20 ng/mL (0-20 µg/L)

Aminotransferase, alanine (ALT) — 0-35 units/L

Aminotransferase, aspartate (AST) — 0-35 units/L

Ammonia, plasma — 40-80 µg/dL (23-47 µmol/L)

Amylase, serum — 0-130 units/L

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 (ambient air)

pH — 7.38-7.44

Pco2 — 35-45 mm Hg (4.7-6.0 kPa)

Po2 — 80-100 mm Hg (10.6-13.3 kPa)

Oxygen saturation — 95% or greater

Blood urea nitrogen — 8-20 mg/dL (2.9-7.1 mmol/L)

C-reactive protein — 0.0-0.8 mg/dL (0.0-8.0 mg/L)

Calcium, serum — 9-10.5 mg/dL (2.2-2.6 mmol/L)

Carbon dioxide, serum — See Bicarbonate

Chloride, serum — 98-106 meq/L (98-106 mmol/L)

Cholesterol, plasma

Total — 150-199 mg/dL (3.88-5.15 mmol/L), desirable

Low-density lipoprotein (LDL) — less than or equal to

130 mg/dL (3.36 mmol/L), desirable

High-density lipoprotein (HDL) — greater than or equal

to 40 mg/dL (1.04 mmol/L), desirable

Complement, serum

C3 — 55-120 mg/dL (550-1200 mg/L)

Total (CH50) — 37-55 U/mL (37-55 kU/L)

Creatine kinase, serum — 30-170 units/L

Creatinine, serum — 0.7-1.3 mg/dL (61.9-115 µmol/L)

Electrolytes, serum

Sodium — 136-145 meq/L (136-145 mmol/L)

Potassium — 3.5-5.0 meq/L (3.5-5.0 mmol/L)

Chloride — 98-106 meq/L (98-106 mmol/L)

Bicarbonate — 23-28 meq/L (23-28 mmol/L)

Fibrinogen, plasma — 150-350 mg/dL (1.5-3.5 g/L)

Folate, red cell — 160-855 ng/mL (362-1937 nmol/L)

Folate, serum — 2.5-20 ng/mL (5.7-45.3 nmol/L)

Glucose, plasma — fasting, 70-100 mg/dL (3.9-5.6 mmol/L)

γ-Glutamyltransferase, serum — 0-30 units/L

Homocysteine, plasma

Male — 0.54-2.16 mg/L (4-16 µmol/L)

Female — 0.41-1.89 mg/L (3-14 µmol/L)

Immunoglobulins

Globulins, total — 2.5-3.5 g/dL (25-35 g/L)

IgG — 640-1430 mg/dL (6.4-14.3 g/L)

IgA — 70-300 mg/dL (0.7-3.0 g/L)

IgM — 20-140 mg/dL (0.2-1.4 g/L)

IgD — less than 8 mg/dL (80 mg/L)

IgE — 0.01-0.04 mg/dL (0.1-0.4 mg/L)

Iron studies

Ferritin, serum — 15-200 ng/mL (15-200 µg/L)

Iron, serum — 60-160 µg/dL (11-29 µmol/L)

Iron-binding capacity, total, serum — 250-460 µg/dL

(45-82 µmol/L)

Transferrin saturation — 20%-50%

Lactate dehydrogenase, serum — 60-100 units/L

Lactic acid, venous blood — 6-16 mg/dL (0.67-1.8 mmol/L)

Lipase, serum — less than 95 units/L

Magnesium, serum — 1.5-2.4 mg/dL (0.62-0.99 mmol/L)

Methylmalonic acid, serum — 150-370 nmol/L

Osmolality, plasma — 275-295 mosm/kg H2O

Phosphatase, alkaline, serum — 36-92 units/L

Phosphorus, serum — 3-4.5 mg/dL (0.97-1.45 mmol/L)

Potassium, serum — 3.5-5.0 meq/L (3.5-5.0 mmol/L)

Prostate-specific antigen, serum – less than 4 ng/mL

(4 µg/L)

Protein, serum

Total — 6.0-7.8 g/dL (60-78 g/L)

Albumin — 3.5-5.5 g/dL (35-55 g/L)

Globulins, total — 2.5-3.5 g/dL (25-35 g/L)

Rheumatoid factor — less than 40 U/mL (40 kU/L)

Sodium, serum — 136-145 meq/L (136-145 mmol/L)

Transferrin saturation — 20%-50%

Triglycerides — less than 150 mg/dL (1.69 mmol/L),

desirable

Troponins, serum

Troponin I — 0-0.5 ng/mL (0-0.5 µg/L)

Troponin T — 0-0.10 ng/mL (0-0.10 µg/L)

Urea nitrogen, blood — 8-20 mg/dL (2.9-7.1 mmol/L)

Uric acid, serum — 2.5-8 mg/dL (0.15-0.47 mmol/ L)

Vitamin B12, serum — 200-800 pg/mL (148-590 pmol/L)

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LABORATORY VALUES

U.S. traditional units are followed in parentheses by equivalent values expressed in S.I. units.

Hematology

Absolute neutrophil count Male — 1780-5380/μL (1.78-5.38 x 10^9 /L) Female — 1560-6130/μL (1.56-6.13 x 10^9 /L) Activated partial thromboplastin time — 25-35 s Bleeding time — less than 10 min Erythrocyte count — 4.2-5.9 x 10^6 /μL (4.2-5.9 x 10^12 /L) Erythrocyte sedimentation rate Male — 0-15 mm/h Female — 0-20 mm/h Erythropoietin — less than 30 mU/mL (30 units/L) D-Dimer — less than 0.5 μg/mL (0.5 mg/L) Ferritin, serum — 15-200 ng/mL (15-200 μg/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 liberated/h per 10^10 cells; score = 13-130/ polymorphonuclear neutrophils and band forms Leukocyte count — 4000-10,000/μL (4.0-10 x 10^9 /L) Mean corpuscular hemoglobin — 28-32 pg Mean corpuscular hemoglobin concentration — 32- g/dL (320-360 g/L) Mean corpuscular volume — 80-100 fL Platelet count — 150,000-350,000/μL (150-350 x 10^9 /L) Prothrombin time — 11-13 s Reticulocyte count — 0.5%-1.5% of erythrocytes; absolute: 23,000-90,000/μL (23-90 x 10^9 /L)

Blood, Plasma, and Serum

Chemistry Studies

Albumin, serum — 3.5-5.5 g/dL (35-55 g/L) Alkaline phosphatase, serum — 36-92 units/L α -Fetoprotein, serum — 0-20 ng/mL (0-20 μg/L) Aminotransferase, alanine (ALT) — 0-35 units/L Aminotransferase, aspartate (AST) — 0-35 units/L Ammonia, plasma — 40-80 μg/dL (23-47 μmol/L) Amylase, serum — 0-130 units/L 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 (ambient air) pH — 7.38-7. Pco 2 — 35-45 mm Hg (4.7-6.0 kPa) Po 2 — 80-100 mm Hg (10.6-13.3 kPa) Oxygen saturation — 95% or greater Blood urea nitrogen — 8-20 mg/dL (2.9-7.1 mmol/L) C-reactive protein — 0.0-0.8 mg/dL (0.0-8.0 mg/L) Calcium, serum — 9-10.5 mg/dL (2.2-2.6 mmol/L) Carbon dioxide, serum — See Bicarbonate Chloride, serum — 98-106 meq/L (98-106 mmol/L) Cholesterol, plasma Total — 150-199 mg/dL (3.88-5.15 mmol/L), desirable Low-density lipoprotein (LDL) — less than or equal to 130 mg/dL (3.36 mmol/L), desirable

High-density lipoprotein (HDL) — greater than or equal to 40 mg/dL (1.04 mmol/L), desirable Complement, serum C3 — 55-120 mg/dL (550-1200 mg/L) Total (CH 50 ) — 37-55 U/mL (37-55 kU/L) Creatine kinase, serum — 30-170 units/L Creatinine, serum — 0.7-1.3 mg/dL (61.9-115 μmol/L) Electrolytes, serum Sodium — 136-145 meq/L (136-145 mmol/L) Potassium — 3.5-5.0 meq/L (3.5-5.0 mmol/L) Chloride — 98-106 meq/L (98-106 mmol/L) Bicarbonate — 23-28 meq/L (23-28 mmol/L) Fibrinogen, plasma — 150-350 mg/dL (1.5-3.5 g/L) Folate, red cell — 160-855 ng/mL (362-1937 nmol/L) Folate, serum — 2.5-20 ng/mL (5.7-45.3 nmol/L) Glucose, plasma — fasting, 70-100 mg/dL (3.9-5.6 mmol/L) γ -Glutamyltransferase, serum — 0-30 units/L Homocysteine, plasma Male — 0.54-2.16 mg/L (4-16 μmol/L) Female — 0.41-1.89 mg/L (3-14 μmol/L) Immunoglobulins Globulins, total — 2.5-3.5 g/dL (25-35 g/L) IgG — 640-1430 mg/dL (6.4-14.3 g/L) IgA — 70-300 mg/dL (0.7-3.0 g/L) IgM — 20-140 mg/dL (0.2-1.4 g/L) IgD — less than 8 mg/dL (80 mg/L) IgE — 0.01-0.04 mg/dL (0.1-0.4 mg/L) Iron studies Ferritin, serum — 15-200 ng/mL (15-200 μg/L) Iron, serum — 60-160 μg/dL (11-29 μmol/L) Iron-binding capacity, total, serum — 250-460 μg/dL (45-82 μmol/L) Transferrin saturation — 20%-50% Lactate dehydrogenase, serum — 60-100 units/L Lactic acid, venous blood — 6-16 mg/dL (0.67-1.8 mmol/L) Lipase, serum — less than 95 units/L Magnesium, serum — 1.5-2.4 mg/dL (0.62-0.99 mmol/L) Methylmalonic acid, serum — 150-370 nmol/L Osmolality, plasma — 275-295 mosm/kg H 2 O Phosphatase, alkaline, serum — 36-92 units/L Phosphorus, serum — 3-4.5 mg/dL (0.97-1.45 mmol/L) Potassium, serum — 3.5-5.0 meq/L (3.5-5.0 mmol/L) Prostate-specific antigen, serum – less than 4 ng/mL (4 μg/L) Protein, serum Total — 6.0-7.8 g/dL (60-78 g/L) Albumin — 3.5-5.5 g/dL (35-55 g/L) Globulins, total — 2.5-3.5 g/dL (25-35 g/L) Rheumatoid factor — less than 40 U/mL (40 kU/L) Sodium, serum — 136-145 meq/L (136-145 mmol/L) Transferrin saturation — 20%-50% Triglycerides — less than 150 mg/dL (1.69 mmol/L), desirable Troponins, serum Troponin I — 0-0.5 ng/mL (0-0.5 μg/L) Troponin T — 0-0.10 ng/mL (0-0.10 μg/L) Urea nitrogen, blood — 8-20 mg/dL (2.9-7.1 mmol/L) Uric acid, serum — 2.5-8 mg/dL (0.15-0.47 mmol/L) Vitamin B 12 , serum — 200-800 pg/mL (148-590 pmol/L)

Endocrine

Adrenocorticotropic hormone (ACTH), serum — 9- pg/mL (2-11 pmol/L) Aldosterone, serum Supine — 2-5 ng/dL (55-138 pmol/L) Standing — 7-20 ng/dL (194-554 pmol/L) Aldosterone, urine — 5-19 μg/24 h (13.9-52.6 nmol/24 h) Catecholamines Epinephrine, plasma (supine) — less than 75 ng/L ( pmol/L) Norepinephrine, plasma (supine) — 50-440 ng/L (296- 2600 pmol/L) Catecholamines, 24-hour, urine — less than 100 μg/m^2 per 24 h (591 nmol/m 2 per 24 h) Cortisol, free, urine – less than 50 μg/24 h (138 nmol/24 h) Dehydroepiandrosterone sulfate (DHEA), plasma Male — 1.3-5.5 μg/mL (3.5-14.9 μmol/L) Female — 0.6-3.3 μg/mL (1.6-8.9 μmol/L) Epinephrine, plasma (supine) — less than 75 ng/L ( pmol/L) Estradiol, serum Male — 10-30 pg/mL (37-110 pmol/L); Female — day 1-10, 14-27 pg/mL (50-100 pmol/L); day 11- 20, 14-54 pg/mL (50-200 pmol/L); day 21-30, 19-41 pg/mL (70-150 pmol/L) Follicle-stimulating hormone, serum Male (adult) — 5-15 mU/mL (5-15 units/L) Female — follicular or luteal phase, 5-20 mU/mL (5- units/L); midcycle peak, 30-50 mU/mL (30-50 units/L); postmenopausal, greater than 35 mU/mL (35 units/L) Growth hormone, plasma — after oral glucose: less than 2 ng/mL (2 μg/L); response to provocative stimuli: greater than 7 ng/mL (7 μg/L) Luteinizing hormone, serum Male — 3-15 mU/mL (3-15 units/L) Female — follicular or luteal phase, 5-22 mU/mL (5- units/L); midcycle peak, 30-250 mU/mL (30-250 units/L); postmenopausal, greater than 30 mU/mL (30 units/L) Metanephrine, urine — less than 1.2 mg/24 h (6.1 mmol/ 24 h) Norepinephrine, plasma (supine) — 50-440 ng/L (296- pmol/L) Parathyroid hormone, serum — 10-65 pg/mL (10-65 ng/L) Progesterone, blood Male (adult) — 0.27-0.9 ng/mL (0.9-2.9 nmol/L) Female — follicular phase, 0.33-1.20 ng/mL (1.0-3.8 nmol/L); luteal phase, 0.72-17.8 ng/mL (2.3-56.6 nmol/L); postmenopausal, <0.2-1 ng/mL (0.6-3.18 nmol/L); oral contraceptives, 0.34-0.92 ng/mL (1.1-2.9 nmol/L) Prolactin, serum Male — less than 15 ng/mL (15 μg/L) Female — less than 20 ng/mL (20 μg/L) Testosterone, serum Male (adult) — 300-1200 ng/dL (10-42 nmol/L) Female — 20-75 ng/dL (0.7-2.6 nmol/L) Thyroid function tests Thyroid iodine (^131 I) uptake — 10%-30% of administered dose at 24 h Thyroid-stimulating hormone (TSH) — 0.5-5.0 μU/mL (0.5-5.0 mU/L) Thyroxine (T 4 ), serum Total — 5-12 μg/dL (64-155 nmol/L) Free — 0.9-2.4 ng/dL (12-31 pmol/L) Free T 4 index — 4- Triiodothyronine, free (T 3 ) — 3.6-5.6 ng/L (5.6-8. Triiodothyronine, resin (T 3 ) — 25%-35%

Triiodothyronine, serum (T 3 ) — 70-195 ng/dL (1.1-3.0 nmol/L) Vanillylmandelic acid, urine — less than 8 mg/24 h (40.4 μmol/24 h) Vitamin D 1,25-dihydroxy, serum — 25-65 pg/mL (60-156 pmol/L) 25-hydroxy, serum — 25-80 ng/mL (62-200 nmol/L)

Urine

Albumin-creatinine ratio — less than 30 mg/g Calcium — 100-300 mg/24 h (2.5-7.5 mmol/24 h) on unrestricted diet Creatinine — 15-25 mg/kg per 24 h (133-221 mmol/kg per 24 h) Glomerular filtration rate (GFR) Normal Male — 130 mL/min/1.73 m 2 Female — 120 mL/min/1.73 m 2 Stages of Chronic Kidney Disease Stage 1 — greater than or equal to 90 mL/min/1.73 m 2 Stage 2 — 60-89 mL/min/1.73 m 2 Stage 3 — 30-59 mL/min/1.73 m 2 Stage 4 — 15-29 mL/min/1.73 m 2 Stage 5 — less than 15 mL/min/1.73 m 2 5-Hydroxyindoleacetic acid (5-HIAA) — 2-9 mg/24 h (10.4-46.8 μmol/24 h) Protein–creatinine ratio – less than or equal to 0.2 mg/mg Sodium — 100-260 meq/24 h (100-260 mmol/24 h) (varies with intake) Uric acid — 250-750 mg/24 h (1.48-4.43 mmol/24 h) (varies with diet)

Gastrointestinal

Gastrin, serum — 0-180 pg/mL (0-180 ng/L) Stool fat — less than 5 g/d on a 100-g fat diet Stool weight — less than 200 g/d

Pulmonary

Forced expiratory volume in 1 second (FEV 1 ) — greater than 80% of predicted Forced vital capacity (FVC) — greater than 80% of predicted FEV 1 /FVC — greater than 75%

Cerebrospinal Fluid

Cell count — 0-5/μL (0-5 x 10^6 /L) Glucose — 40-80 mg/dL (2.2-4.4 mmol/L); less than 40% of simultaneous plasma concentration is abnormal Pressure (opening) — 70-200 mm H 2 O Protein — 15-60 mg/dL (150-600 mg/L)

Hemodynamic Measurements

Cardiac index — 2.5-4.2 L/min/m 2 Left ventricular ejection fraction — greater than 55% Pressures Pulmonary artery Systolic — 20-25 mm Hg Diastolic — 5-10 mm Hg Mean — 9-16 mm Hg Pulmonary capillary wedge — 6-12 mm Hg Right atrium — mean 0-5 mm Hg Right ventricle Systolic — 20-25 mm Hg Diastolic — 0-5 mm Hg

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LABORATORY VALUES

U.S. traditional units are followed in parentheses by equivalent values expressed in S.I. units.

Hematology

Blood, Plasma, and Serum

Chemistry Studies

Endocrine

Urine

Gastrointestinal

Pulmonary

Cerebrospinal Fluid

Hemodynamic Measurements