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Common Laboratory (LAB) Values [ A ]

A

Lab (Specimen)

Conventional Units

SI Units

Acetylcholinesterase (RBC)
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11,000 - 15,000 IU/L 11-15 kIU/L
Acid Phosphatase Prostatic (Immunoassay) Serum
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0.0-3.5 ng/mL 0.0-3.5 ng/mL
Acid Phosphatase, Total, Serum (Enzymatic) 
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0.0-4.3 U/L 0.0-4.3 U/L
Adrenocorticotropic Hormone (ACTH) (Plasma).  Immunoassay top of page
(<70 pg/mL). 
Male and female:
1 week- 9 yrs: 5-46 pg/mL.
10 -18 yrs: 6-55 pg/mL.

Female: >/=19 yrs: 6 -58 pg/mL.
Male: >/=19 yrs: 7 -69 pg/mL
<15 pmol/L
Alanine Aminotransferase (ALT), Serum

Formerly “SGPT” [Serum glutamic pyruvic transaminase]
– Normal: 5 - 35 IU/dL.
– Found in heart, liver, and skeletal muscle.
– Much more specific marker of liver injury than AST.
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Males 0 - 35 U/L;
Females 0 - 20 U/L
Males 0 - 35 U/L;
Females 0 - 20 U/L
Albumin (Serum)
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3.5 - 5 g/dL 30 - 50 g/L
Aldosterone (Serum)
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Age Posture Unspecified Supine Upright
0-6 days 5.0 - 102.0 ng/dL    
1-3 weeks 6.0 -179.0 ng/dL    
1-11 months 7.0 -99.0 ng/dL    
1-2 years 7.0 -93.0 ng/dL    
3-10 years 4.0 -44.0 ng/dL    
11-14 years 4.0 -31.0 ng/dL    
15 years and older 31.0 ng/dL or less 16.0 ng/dL or less 4.0-31.0 ng/dL
Alkaline phosphatase Isoenzymes top of page
Male:
Serum or plasma:
0-30 days: 60-320 U/L
1-11 months: 70-350 U/L
1-3 years: 125-320 U/L
4-6 years: 150-370 U/L
7-9 years: 150-440 U/L
10-11 years: 150-470 U/L
12-13 years: 160-500 U/L
14-15 years: 130-530 U/L
16-19 years: 60-270 U/L
20 and older: 40-120 U/L
Bone:
1-6 years: 0-208 U/L
7-9 years: 0-264 U/L
10-15 years: 0-340 U/L
16-19 years: 0-165 U/L
20 and older:  0-55 U/L
Liver:
1-6 years: 0-145 U/L
7-11 years: 0-182 U/L
12-15 years: 0-226 U/L
16-19 years: 0-114 U/L
20+ years: 0-94 U/L
Female:
Serum or plasma:
0-30 days: 60-320 U/L
1-11 months: 70-350 U/L
1-3 years: 125-320 U/L
4-6 years: 150-370 U/L
7-9 years: 150-440 U/L
10-11 years: 150-530 U/L
12-13 years: 110-525 U/L
14-15 years: 55-305 U/L
16-19 years: 40-120 U/L
20 and older: 40-120 U/L
Bone:
1-6 years: 0-189 U/L
7-9 years: 0-246 U/L
10-13 years: 0-340 U/L
14-15 years: 0-91 U/L
16+ years: 0-55 U/L
Liver:
1-9 years: 0-148 U/L
10-15 years: 0-162 U/L
16+ years: 0-94 U/L
Ammonia, Plasma
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0.17 - 0.80 µg/mL
Alt Source: 15-45 µg/dl
10 - 47 µmol/L
Alt source: 11-32 µmol/L
Amylase, Isoenzymes (Serum)

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Component Reference Interval
Pancreatic amylase 18 months-6 years: 0-68 U/L
7-17 years: 9-39 U/L
18 years and older: 12-52 U/L
Salivary amylase 18 months and  older:  9-86 U/L
Total amylase 18 -35 months: 19-92 U/L
3 -4 years: 26-106 U/L
5-12 years: 30-119 U/L
13 years and older: 30-110 U/L

ALT
35 -118 IU/L  (0.58 -1.97 mckat/L)
Anion Gap    
Anti-Nuclear Antibody (ANA) Titer
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(Negative) <1:40 Titer  
Antithrombin III Activity (Plasma) 

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1-4 days: 39-87%
5-29 days: 41-93%
30-89 days: 48-108%
90-179 days: 73-121%
180-364 days: 84-124%
1-6 years: 82-139%
7-9 years: 96-135%
10-11 years: 92-134%
12-13 years: 92-128%
14-15 years: 95-135%
16-17 years: 94-131%
18 years and older: 76-128%
Normal reference range:
69 - 132%
Antithrombin ??? (AT ???)
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80-120 U/dL 800-1200 U/L
Anti-Thyroglobulin Antibody Screen (Serum)   top of page <1.0 IU/mL < 1 kU/L
Alpha-1-Antitrypsin (Serum) 
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80-200 mg/dL 0.8 - 2.0 g/L
Arterial Blood Gases (ABGs)    
Aspartate Aminotransferase (AST), Serum

 – Formerly “SGOT”  [Serum glutamic oxaloacetic transaminase]
– Normal: 5 - 35 IU/dL.
– Found in heart, liver, and skeletal muscle.
– Not as specific a marker as ALT for liver injury.  top of page
(<42 U/L )
Males: 0 - 37 U/L
Females: 0 - 31 U/L
Using the AST/ALT ratio can help in differential diagnosis

– AST/ALT > 2 indicates chronic alcoholism.

Important Notes   top of page icon

>Unless noted, all values are for adults.
>All laboratory values listed are method dependent (Methods include: immunoassay, colorimetry, electrophoresis, HPLC, etc).
>Values may vary between laboratories.
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Medical Calculators - A thru Z
Lab Values - A thru Z