Forearm Ischemic Exercise Test, Blood

Message

Call CoxHealth Laboratories at 417-269-7820 to schedule test. Test must also be scheduled with Physical Therapy Department.
Multiple (6) specimens will be drawn (baseline, before work period, and then specimens at 1-, 3-, 5-, 10-, and 15-minutes after cessation of work).

Test Code

7303

CPT Codes
83605 x 6-Lactic acid; 82140 x 6-Ammonia

Includes

Includes ammonia and lactic acid

Preferred Specimen

Container/Tube: Grey-top (potassium oxalate/sodium fluoride) tubes
Specimen Volume: Full tube for each specimen
Collection Instructions: Both lactate and ammonia can be performed on this tube.
    1. Insert heparin lock 15 minutes before drawing baseline specimen.
    2. Draw baseline specimen 15 minutes after heparin lock is inserted, and place tube of blood on ice.
    3. Place blood pressure cuff above elbow on arm to be tested and inflate to 20 mm Hg above systolic blood pressure.
    4. Remain with patient and Physical Therapist during exercise portion of test.
    5. Nursing will draw blood specimens in potassium oxalate/sodium fluoride tubes at 1-, 3-, 5-, 10-, and 15-minutes after cessation of exercise for lactate and ammonia.
    6. Label tube with patient’s name (first and last) and date and actual time of collection.

Minimum Volume

Full tube for each specimen

Transport Temperature

Refrigerate

Methodology
Lactic Acid: Enzymatic/Lactate to Pyruvate
Ammonia: Glutamate Dehydrogenase Enzymatic .

Setup Schedule

Monday through Friday

Reference Range

AMMONIA No established reference values
LACTIC ACID 3- to 5-fold increase in lactic acid over resting levels.

Clinical Significance

Useful for screening for disorders of carbohydrate metabolism and myoadenylate deaminase deficiency.

Performed By
CoxHealth

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.