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HelpTest Code LDI Lactate Dehydrogenase (LD) 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 Medical 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 |
|---|---|---|
| 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; Continuously
LD isoenzymes: Tuesday, Thursday, Saturday; 10 a.m.
Test Classification
This test has been cleared or approved 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 | In Process |
| 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
|
Hemolysis |
Mild reject; Gross reject |
|
Lipemia |
Mild OK; Gross OK |
|
Icterus |
NA |
|
Other |
NA |
Method Name
LDI: Electrophoresis Densitometry
LD: Photometric Rate
Forms
1. If not ordering electronically, complete, print, and send a Gastroenterology and Hepatology Test Request Form (T728) with the specimen (http://www.mayomedicallaboratories.com/it-mmfiles/gastroenterology-and-hepatology-test-request.pdf)
2. Biochemical Genetics Patient Information (T602) in Special Instructions.