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HelpTest Code LDI Lactate Dehydrogenase (LDH) Isoenzymes, Serum
Additional Codes
EMR Interface Order Code: 07110
Reporting Name
Lactate Dehydrogenase Isoenzymes, SUseful For
Investigating a variety of diseases involving the heart, liver, muscle, kidney, lung, and blood
Differentiating heart-synthesized lactate dehydrogenase (LD) from liver and other sources
Investigating unexplained causes of LD elevations
Detection of macro-LD
Profile Information
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| LD | Lactate Dehydrogenase (LD), S | Yes | Yes |
| LDI | LD Isoenzymes, S | No | Yes |
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
SerumNecessary Information
Patient's age is required.
Specimen Required
Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Specimen Volume: 2 mL divided into 2 tubes each containing 1 mL
Specimen Minimum Volume
0.75 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Ambient (preferred) | 7 days | |
| Refrigerated | 48 hours |
Reference Values
LACTATE DEHYDROGENASE (LD)
1-30 days: 135-750 U/L
31 days-11 months: 180-435 U/L
1-3 years: 160-370 U/L
4-6 years: 145-345 U/L
7-9 years: 143-290 U/L
10-12 years: 120-293 U/L
13-15 years: 110-283 U/L
16-17 years: 105-233 U/L
≥18 years: 122-222 U/L
LD ISOENZYMES
I (fast band): 17.5-28.3%
II: 30.4-36.4%
III: 19.2-24.8%
IV: 9.6-15.6%
V (slow band): 5.5-12.7%
Day(s) and Time(s) Performed
LD: Monday through Sunday
LD isoenzymes: Monday, Wednesday, Friday
Test Classification
This test has been cleared, approved or is exempt by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
83615-LD
83625-LD isoenzymes
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| LD_I | Lactate Dehydrogenase Isoenzymes, S | 42929-0 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| LD | Lactate Dehydrogenase (LD), S | 14804-9 |
| 305 | LD Isoenzymes, S | 49279-3 |
| 3344 | Total LD Activity | 14804-9 |
| 2282 | I, Heart | 2536-1 |
| 2283 | II | 2539-5 |
| 2285 | III | 2542-9 |
| 2286 | IV | 2545-2 |
| 2287 | V, Liver | 2548-6 |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
Method Name
LDI: Electrophoresis Densitometry
LD: Photometric Rate
Forms
Biochemical Genetics Patient Information (T602) in Special Instructions