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Test Code LMWHXA Heparin Anti-Xa, Low Molecular Weight

Specimen Type

Blood

Preferred Collection Container

BLUE

Acceptable Collection Container

BLUE (3.2% buffered sodium citrate)

Collection Instructions

Routine venipuncture. If multiple tests are being drawn, the recommended order of draw is as follows: blood cultures, sodium citrate tubes, gel separator/plain serum plastic tubes, heparin tubes, EDTA tubes. A special tube should be obtained from the laboratory for hematocrits over 55%. Specimens should be transported as soon as possible to the Clinical Laboratory. Optimal time of testing is 4 hours post dosage.

Rejection Criteria

Specimens that are clotted, hemolyzed, diluted with IV fluid, insufficient volume, improperly labelled.

Specimen Storage and Stability

Separate plasma, double-spin, transfer to plastic tubes and freeze in 1 mL aliquots at -70�C if test cannot be run within 4 hrs.

Day(s) and Time(s) Performed

Monday through Sunday, 24 hours

EPIC Code

LAB316

Turn Around Time

4 Hours

Lab Department

Hematology

Alias

.i, Heparin Xa; Anti Xa;Lovenox monitoring:

Ordering Info

NOTE: Collection of blood for coagulation testing through indwelling catheters that have been flushed with heparin should be avoided, if possible. If specimen is drawn through an indwelling catheter, the line should be flushed with 5 ml saline and the first 5 ml of blood or six times the deadspace volume of the catheter being used should be discarded. Proper collection and handling of specimens is critical.

Pediatric Collection Container

BLUE