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Non-specific
LDH is specific or non-specific?
Oxidoreductase
LDH classification
1.1.1.27
LDH enzyme commission number
Lactic acid, Pyruvic acid
LDH catalyzes the interconversion of these 2 acids
Zinc
Element found in LDH; part of glycolytic pathway
4
LDH amount of subunits
H, M
2 possible forms of LDH subunits
Nicotinamide adenine dinucleotide
LDH coenzyme
Heart, RBC, Kidneys, Lungs, Pancreas, Spleen, Skeletal muscle, Liver, Intestine
LDH tissue sources
Pernicious anemia, Hemolytic anemia, Acute myocardial infarction, Hepatic carcinoma, Toxic hepatitis
LDH increased in these conditions
LDH flipped pattern
Why is LDH important in AMI?
LD2 > LD1
Normal LD pattern
LD1 > LD2
LDH flipped pattern
Wrobleuski-La Due method
LDH determination method used in laboratory activity
LDH Reverse Reaction
Principle of method
pH 7.4-7.9
Wrobleuski La Due method pH
Forward/Direct Reaction
What kind of reaction is seen in Wacker method?
pH 8.8
Wacker method pH
340 nm
Wacker method wavelength
Wacker method
Most commonly used method for LDH (produces a positive rate)
pH 7.2
Wrobleuski La Due method pH
Wrobleuski-La Due method
What is faster? Wrobleuski La Due or Wacker method?
Non-hemolytic serum
Preferred specimen
Heparinized or EDTA plasma
Other acceptable specimen
15-25°C
LDH specimen temp if stable for 24 hours
2-8°C
LDH specimen temp if stable for 3 days
20°C
LDH specimen temp if stable for 6 weeks
225-450 U/L
LDH expected value
0.017
LDH U/L to ukat/L conversion factor
43.8-1200 U/L
LDH kit measuring range
2 mL
LDH working reagent volume
0.040 mL
LDH sample volume
1 minute, 37°C
LDH incubation time and temperature
Bilirubin up to 20 mg/dL, Triglycerides up to 500 mg/dL, Hemoglobin up to 5 g/dL
LDH interferences
340 nm
LDH absorbance
40 uL
LDH sample volume in uL
2000 uL
LDH reagent volume in uL
60 seconds
LDH lag time
60 seconds
LDH kinetic interval
8095
LDH kinetic factor
4
LDH number of readings
37°C
LDH reaction temperature
Water
LDH blank with?
U/L
LDH unit of measurement
Decreasing
LDH reaction direction