Common Laboratory Values for Lab Tests
[ Miscellaneous tables / Articles ]
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Normal Lab Reference Values
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Lab (Specimen)
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Conventional Units
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SI Units
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17-Ketogenic steroids (urine) |
Male: 5 - 23 mg/day Female: 3 - 15 mg/day |
Male: 17 - 80 µmol/day Female: 10 - 52 µmol/day |
Lactate dehydrogenase LDH (serum) isoenzymes

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LD-1: 14-30% of total LD-2: 29-48% of total LD-3: 16-25% of total LD-4: 8-12% of total LD-5: 6-20% of total |
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Lactate Dehydrogenase, Total:

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0 up to 30 days: 200-465 U/L 1-17 months: 200-450 U/L 18 mo-10 yr: 165-430 U/L 11-16 years: 127-287 U/L > 17 yrs: 105-230 U/L
Alt: > 17yr: </= 270 U/L |
Alt: > 17yr: </= 4.5 µkat/L |
Lactic acid (plasma (venous)) |
9 - 16 mg/dL |
1.0 - 1.8 mmol/L |
Lead (blood)
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< 25 µg/dL |
< 1.21 µmol/L |
Lipase (serum)  |
7 - 60 U/L |
0.12 - 1.00 µkat/L |
Low density lipoprotein (LDL) cholesterol (serum)
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Desirable: < 130 mg/dL Borderline-high: 130 -159mg/dL High: >/= 160 mg/dL |
Desirable: < 3.36 mmol/L Borderline-high: 3.36 - 4.11 mmol/L High: >/= 4.14 mmol/L |
Luteinizing hormone (LH) serum
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Age |
Male (IU/L) |
Female (IU/L) |
0-23 mo |
0.5-1.9 |
0.0-0.5 |
2-10 y |
0.0-0.5 |
0.0-0.5 |
11-20 y |
0.5-5.3 |
0.5-9.0 |
20-70 y |
1.5-9.3 |
0.0-76.3 |
70-100 y |
3.1-34.6 |
5.0-52.3 |
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Follicular: 2.4 - 12.6 |
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Midcycle: 14 - 95.6 |
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Luteal: 1.0 - 11.4 |
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Pregnant: 0.0-1.5 |
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Postmenopausal: 7.7 - 58.5 |
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Contraceptives: 0.7-5.6 |
Tanner Stage |
I |
0.0-1.0 IU/L |
0.0-9.3 IU/L |
II |
0.0-3.6 IU/L |
0.0-16.0 IU/L |
III |
0.2-6.4 IU/L |
0.0-23.0 IU/L |
IV & V |
0.9-8.3 IU/L |
0.0-19.1 IU/L |
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Lymphocyte surface markers (T cell) Blood
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Components |
Age: 0-11 mo |
Age: 12-23mo |
Age: > 2 yr |
% CD4 (Helper T-cells) Absolute CD4 |
38-62% 1580-4850 |
31-54% 1020-3600 |
32-62% 381-1469 |
% CD45RA (Naive helper T-cells) Absolute CD45RA |
15-70% 200-3400 |
15-70% 200-3400 |
3-38% 44-869 |
% CD45RO (Memory helper T-cells) Absolute CD45RO |
5-30% 50-1500 |
5-30% 50-1500 |
16-46% 92-1040 |
% CD8 (Suppressor T-cells) Absolute CD8 |
16-34% 680-2470 |
16-38% 570-2230 |
12-45% 196-1060 |
CD4: CD8 ratio |
1.17-6.62 |
1.17-6.62 |
0.80-5.00 |
% CD3 (Total T-cells) Absolute CD3 |
58-85% 2170-6500 |
53-81% 1460-5440 |
58-87% 684-2170 |
% CD19 (B-cells) Absolute CD19 |
11-45% 430-3300 |
11-45% 430-3300 |
5-23% 116-613 |
% NK-cells Absolute NK-cells |
3-19% 80-340 |
3-19% 80-340 |
4-27% 76-570 |
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Age |
95% CI |
Percentage (min/max) |
Cells/mm3 (min/max) |
Minimum |
Minimum |
CD3 |
Neonates |
28 - 76 |
600 -5000 |
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1 wk - 2 mo |
60 - 85 |
2300 -7000 |
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2-5 mo |
48 -75 |
2300 -6500 |
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5-9 mo |
50 -77 |
2400 -6900 |
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9-15 mo |
54 -76 |
1600 -6700 |
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15-24 mo |
39 -73 |
1400 -8000 |
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2-5 y |
43 -76 |
900 -4500 |
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5-10 y |
55 -78 |
700 -4200 |
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10-16 y |
52 -78 |
800 -3500 |
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Adults |
58 -86 |
622 -2402 |
CD3+CD4+ |
Neonates |
17 -52 |
400 -3500 |
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1 wk - 2 mo |
41 -68 |
1700 -5300 |
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2-5 mo |
33 -58 |
1500 -5000 |
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5-9 mo |
33 -58 |
1400 -5100 |
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9-15 mo |
31 -54 |
1000 -4600 |
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15-24 mo |
25 -50 |
900 -5500 |
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2-5 y |
23 -48 |
500 -2400 |
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5-10 y |
27 -53 |
300 -2000 |
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10-16 y |
25 -48 |
400 -2100 |
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Adults |
31 -59 |
359 -1519 |
CD3+CD8+ |
Neonates |
10 -41 |
200 -1900 |
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1 wk - 2 mo |
9 -23 |
400 -1700 |
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2-5 mo |
11 -25 |
500 -1600 |
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5-9 mo |
13 -26 |
600 -2200 |
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9-15 mo |
12 -28 |
400 -2100 |
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15-24 mo |
11 -32 |
400 -2300 |
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2-5 y |
14 -33 |
300 -1600 |
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5-10 y |
19 -34 |
300 -1800 |
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10-16 y |
9 -35 |
200 -1200 |
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Adults |
12 -36 |
109 -897 |
T4:T8 ratio |
Adults |
0.92 -3.72 |
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CD19+ |
Neonates |
5 -22 |
40 -1100 |
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1 wk - 2 mo |
4 -26 |
600 -1900 |
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2-5 mo |
14 -39 |
600 -3000 |
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5-9 mo |
13 -35 |
700 -2500 |
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9-15 mo |
15 -39 |
600 -2700 |
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15-24 mo |
17 -41 |
600 -3100 |
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2-5 y |
14 -44 |
200 -2100 |
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5-10 y |
10 -31 |
200 -1600 |
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10-16 y |
8 -24 |
200 -600 |
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Adults |
3 -25 |
12 -645 |
CD3-CD56+ |
Neonates |
6 -58 |
100 -1900 |
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1 wk - 2 mo |
3 -23 |
200 -1400 |
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2-5 mo |
2 -14 |
100 -1300 |
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5-9 mo |
2 -13 |
100 -1000 |
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9-15 mo |
3 -17 |
200 -1200 |
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15-24 mo |
3 -16 |
100 -1400 |
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2-5 y |
4 -23 |
100 -1000 |
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5-10 y |
4 -26 |
90 -900 |
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10-16 y |
6 -27 |
70 -1200 |
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Adults |
1 -19 |
24 -406 |
Pediatric reference intervals are from Comans-Bitter WM, et al, “Immunophenotyping of Blood Lymphocytes in Childhood,” J Pediatrics, 1997, 130:388-93 |
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