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Laboratory Medicine

Test Directory / Fluid Lactate Dehydrogenase

Fluid Lactate Dehydrogenase

Urine monovette or white topped universal (no additives)

TestFluid Lactate Dehydrogenase
Common AbbreviationsFLLDH
Tube typeUrine monovette or white topped universal (no additives)
Clinical IndicationFluid LDH measurement may be used to distinguish between transudate and exudate fluid formation when the fluid protein result is equivocal.
Specimen TypeFluid
Sample typeFluid
Minimum Volume1 mL
Special PrecautionsPlease visually inspect samples before sending for analysis and indicate the site of collection. Samples which are very turbid or thick may be rejected as there is a risk of damage to laboratory equipment
StabilityNo specific data available for fluids. LDH is stable in serum for 4 days at 2-8°c and for 7 days at 15-25°c
Turnaround TimeInpatient: 6 hours Outpatient/ GP: 24 hours
LaboratoryYork and Scarborough
Reference IntervalLight's criteria states a sample is an exudate if fluid protein / serum protein ratio > 0.5, fluid LDH / serum LDH ratio > 0.6 or fluid LDH is greater than two-thirds of upper limit of the serum reference range. For further information please refer to
Limitations Fluid composition tends to be very variable, and the exact mixture of components in a fluid sample can have unpredictable effects on measurement of any one analyte. Our laboratory methods are NOT CE-marked or validated for analysis of fluids, and no specific quality control materials are available. ALL results must be interpreted with caution.
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